How to Make Homemade Instant Oatmeal

Homemade instant oatmeal makes it easy to enjoy a warm, satisfying bowl of oatmeal that’s good for you. With a few pantry ingredients and about seven minutes of prep, you’ll have a quick breakfast option that cooks in just three minutes and tastes like real food.

I keep a large tub of this homemade oatmeal mix in my cupboard for every day use. And, when we’re travelling or camping I make individual packs for quick and easy breakfasts to fuel busy days.

Oats are a whole grain that provide fibre, vitamins, minerals, some protein and naturally occurring plant compounds that work together to help manage blood sugar, support heart health, and can keep you feeling full. In particular, oats have a unique soluble fibre called beta glucan that has been repeatedly shown to support heart health and gut health.

Also Read: Homemade Seasoning Blends, How to Dehydrate Apples, Apple Pie Overnight Oats

Why Size Matters

Oats come in several forms: steel-cut, large flake (old-fashioned), quick oats, and instant oats. All of them are whole grain oats. The difference is how much they’ve been cut, rolled and otherwise processed.

The size of the oat matters. Larger flakes have a lower glycaemic index (a measure of how quickly a food raises blood sugar). For you and me, that means bigger oat flakes digest more slowly which helps us stay fuller longer, and provides steadier energy instead of a quick spike and crash.

That’s why this recipe starts with large flake oats.

For the convenience, we want fast cooking. That’s where the food processor comes in. By pulsing some of the oats into a coarse meal and leaving the rest whole, the final oatmeal cooks quickly but still has the hearty texture and staying power of larger flakes. It’s a practical compromise that works.

Isn’t that the same as Instant Oats? No. A course chop in the food processor is not the same. Instant oats are rolled very thin and are pre-cooked and dehydrated. This makes them super quick to cook, but also puts them about 20 points higher on the Glycemix index. That’s like the difference between eating a whole apple and drinking a glass of apple juice.

Is Oatmeal Bad For You?

You may have seen or heard various “internet health gurus” saying oats or oatmeal are bad for you and the worst breakfast imagineable. I checked in with my favourite Registered Dietitians to get some perspective:

First, let’s start with all the good things oats bring to the table. Here’s what Registed Dietitian Desiree Nielsen says.

Whole grain rolled oats punch well above their weight nutritionally. A typical 1/2 cup serving delivers about 8 g of fibre and 6 g of plant protein, along with key minerals like iron, magnesium, zinc, potassium, phosphorus, and copper that support energy, immunity, muscles, and overall health. Oats are also rich in unique phytochemicals called avenanthramides, known for their antioxidant and anti-inflammatory effects (yes, that soothing oat bath is doing real work). What really sets oats apart is their soluble fibre, beta-glucan, which forms a gentle gel during digestion. This slows glucose absorption for steadier blood sugars and energy, helps lower cholesterol by binding bile, supports fullness and satiety, feeds beneficial gut bacteria, and improves constipation by keeping things moving. In short, oats are simple, affordable, and quietly powerful.

What about Phytic Acid? – The claim is that oats contain phytic acid that rob your body of minerals and prevent absorption. Yes, oats contain phytic acid. So do beans, nuts, seeds, whole grains, and many vegetables. Phytic acid can bind to minerals in food, but in real-world diets this does not cause mineral deficiencies for people eating a varied diet. In fact, phytic acid also has antioxidant benefits. Cooking oats, soaking them (think overnight oats), fermenting or combining them with fermented food (like Greek yogurt or kefir) reduces phytic acid further. If this is a concern for you, pair oatmeal with vitamin C–rich foods like berries or citrus and a source of protein (yogurt, nuts, seeds) to support mineral absorption.

What about traces of Glyphosate? This concern gets a lot of airtime online. Trace amounts of glyphosate (commonly referred to as RoundUp (a chemical used in growing crops)) have been detected in many conventional foods, not just oats. The levels found in oats are well below safety thresholds set by Canadian and international regulators. If this worries you, choosing organic oats can reduce exposure, but there is no credible evidence that eating oatmeal at typical amounts poses a health risk.

What about high carbs leading to blood sugar spikes? Oats are carbohydrates, yes. But they’re paired with fibre, especially beta-glucan, which slows digestion and glucose absorption. That goes back to Size Matters! The more processed the oats, the more quickly they are digested and the more likely they are to cause blood sugar spikes. Ideally, choose the largest, most intact form of oats you can and pair it with fruits protein and fat (milk, yogurt, nuts, seeds, peanut butter) to make them even more blood-sugar friendly.

6 Reasons Why Make Homemade Instant Oatmeal Is Better

1. Better texture and staying power

Homemade instant oatmeal uses large flake (old-fashioned) oats, which digest more slowly than finely processed instant oats. For most people, that means steadier energy and feeling full longer, instead of a quick spike and crash.

2. More fibre, less sugar and sodium

When you make your own oatmeal mix, you control what goes into it. This version provides more fibre per serving and less added sugar and sodium than most store-bought instant oatmeal packets.

3. Still quick and convenient

This mix cooks in about three minutes, just like instant oatmeal. You get the speed of packaged oats without giving up texture or flavour.

4. Costs less per bowl

Buying oats and other pantry staples in bulk keeps costs down. Homemade instant oatmeal works out to less per serving than packaged packets, and the bowl itself is larger and more filling.

I did the math! In January 2026, my homemade instant oatmeal worked out to about $.20/per serving compared to Instant Quaker Oat Packs that cost $.47/per serving. My serving size was 1/2 cup dry or 60g while the packet was 1/3 cup dry or 43 g.

5. Easy to customize

How do you like your oatmeal? Plain, nutty, fruity, more soupy or more firm? You control the ingredients in the master mix. For example, you can add more protein with whey, create more texture with milk powder or coconut milk powder, or add your favourite dried nuts, seeds and fruits. Of course, each bowl can be topped with whatever fruit, nuts, seeds, or yogurt you have on hand, so you’re never limited to a single flavour.

6. Fewer packages, less waste

Making your own oatmeal reduces single-serve packaging and who doesn’t love that?

Instant Oatmeal Variations

The beauty of this mix is how flexible it is. Once you have the base, you can easily tweak it to suit your taste, your nutrition goals, or what you have on hand.

• More or less sweet:
  Adjust the sugar to your liking. Use more or less brown sugar, or swap it for white sugar, maple sugar, stevia, or another granulated sweetener you enjoy.
• Change the fibre boost:
  Use more or less ground flax, replace flax with psyllium husk, or add hemp seeds or chia seeds.
• Texture tweaks:
  Grind more of the oats for a smoother, creamier oatmeal, or grind fewer for a chunkier, heartier texture.
• Creamier oatmeal:
  Add milk powder or coconut milk powder so the oatmeal reconstitutes into a creamy bowl with just water.
• Boost the protein:
  Stir in protein powder, nut butter, Greek yogurt, cottage cheese, protein powder, etc. to increase the protein content. Start with a small amount so the texture stays pleasant.
• Switch up the spices:
  Swap cinnamon for pumpkin pie spice, orange zest or try a powdered concentrate like True Orange, powdered vanilla, or spices like cardamom, nutmeg, turmeric, or ginger.
• Ready-to-go flavoured packs:
  Add nuts, seeds, or dried fruit directly to the mix for grab-and-go portions. This is especially handy for camping trips. Or, instead of preparing your own blend of nuts and seeds, add a handful of your favourite trail mix.

How to Store Homemade Instant Oatmeal Mix

• Store the full batch in a large glass or plastic container with a tight-fitting lid to keep air and moisture out. Bonus if you pop in a half cup measuring scoop for quick easy measuring.
• For travel or portability, portion the mix into individual sealed bags. A vacuum sealer works especially well.
• If kept dry and airtight, this mix can last for a long time, but for best flavour and quality, use it within 3 to 6 months.

Favourite Toppings for Hot Oatmeal

Once the oatmeal is cooked, you can really make it your own. I’m a sucker for endless fruit and nut/seed combos – but you don’t have to stop there – here are some combos to get you started:

• Blueberries or dark cherries, almonds and a dash of almond extract
• Apples and pecans
• Banana and walnuts
• Cranberries and orange zest
• Yogurt and raspberries

And when you want something a little more comforting:

• Peanut butter or almond butter stirred in while hot with a dollop of jam or jelly
• A few chocolate chips
• Crumbled cookies or biscotti (yes, really)
• Granola for extra crunch

Recipe for Homemade Instant Oatmeal

Another way to get quick oatmeal in the morning is to make some overnight oats. Mix at night and it’s ready to eat in the morning.

When it comes to homemade convenience, this recipe is one of my favorites. For more recipes, check out the complete list at Homemade Convenience Foods.