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Brownie Baked Oatmeal

Published: Sep 10, 2025 by Janessa · This post may contain affiliate links · 1 Comment

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A little indulgent and a lot nourishing- this protein packed brownie baked oatmeal is proof you can have your cake (er... brownie) and eat it too (for breakfast!).

Jump to:
  • Breakfast at a Glance
  • Nessy's Note
  • Ingredients and Substitutions
  • My Notes for the Best Brownie Baked Oatmeal
  • More Baked Oatmeal Recipes...
Baked oatmeal topped with nut butter.

Breakfast at a Glance

  • Prep Time: 10 minutes (+ bake for 30 minutes)
  • Planning Ahead: Prep it completely ahead of time or prep it first thing in the morning and enjoy a warm breakfast about 30 minutes later
  • Morning Effort: Can be made entirely ahead of time or takes about 10 minutes hands on in the morning
  • Protein: 27 grams per serving
  • Fiber: 10 grams per serving

Nessy's Note

Let's be real- sometimes a girl just wants to eat a brownie... for breakfast.

But sometimes, that same girl also wants a breakfast that actually keeps her full and energized all morning instead of leaving her crashing by 9am (the way High Protein Breakfast Casserole holds her over!).

So, she sets out to create a baked oatmeal that's balanced with protein, fiber and healthy fats but that gives some brownie vibes.

Okay, you got me. That girl is me. And this brownie baked oatmeal is the solution to my brownie for breakfast predicament. Hopefully it will be for you too!

Ingredients and Substitutions

Ingredients measured out in bowls.
  • Rolled Oats- I usually use large flake rolled but instant or quick oats should work as well.
  • Protein Powder- I most often use pea protein isolate for this recipe but have tested it with brown rice protein as well. I suspect any plain, unflavored protein powder should work. If you use a flavored/sweetened one, you may need to adjust the recipe and I haven't tested this.
    • Substitution: If you prefer, you can replace this with oat flour. Just pulse about ⅔ cup of oats in the blender until flour-like. The recipe still has about 17 grams of protein per serving with this swap.
  • Cocoa Powder- The key for giving these oats that chocolate brownie vibe! Natural or dutch process will work as well as cacao powder.
  • Ground Flaxseed- This adds some fiber to the baked oatmeal as well as helps with binding.
    • Substitution: You can replace it with additional rolled oats (replace with ⅓ cup of oats) if needed.
  • Water- I opted for water in this recipe to keep it easy.
    • Substitution: If you would like to bump up the protein a bit (about 2 grams per serving), you can use dairy milk instead.
  • Honey- This can be reduced to ¼ cup for a less sweet baked oatmeal and increased up to ½ cup to make it sweeter. I recommend melting it before adding it for easy mixing.
    • Substitution: Maple syrup also works well.
  • Almond Butter- This helps to make the baked oatmeal more dense and fudgy (like a brownie) as well as adding some healthy fats and protein to make it filling.
    • Substitution: I opt for almond butter because the flavor works well with chocolate but any nut or seed butter you like would work.
  • Eggs- These help bind the oats and add a bit of protein.
    • Substitution: I haven't tested it but I suspect that this recipe would work with flax eggs as well.
  • Salt- Just a pinch balances the flavors. Any type of salt should work.
Baked oatmeal dished out in a bowl.

My Notes for the Best Brownie Baked Oatmeal

  • Bake right away. Don't let the batter sit as the oats and flax will soak up liquid and change to texture. Mix and then bake.
  • Customize the sweetness. You can reduce the honey to ¼ cup for a less sweet version or increase up to ½ cup if you prefer it sweeter.
Breakfast food in a bowl.

More Baked Oatmeal Recipes...

  • Baked Oats for One
  • Peanut Butter Baked Oatmeal

If you give this recipe a try, be sure to let me know what you thought in the comments below!

Spoon taking a scoop of baked oatmeal.

Brownie Baked Oatmeal

A little indulgent and a lot nourishing- this protein packed brownie baked oatmeal is proof you can have your cake (er... brownie) and eat it too (for breakfast!).
Print Pin Recipe
Prep Time 10 minutes minutes
Cook Time 30 minutes minutes
Total Time 40 minutes minutes
Servings 4

Equipment

  • 9x9, 8x8 or 11x7 inch baking pan (minimum 2 inches in depth); ~3 quart volume

Ingredients

  • 1 and ⅓ cups large flake rolled oats *
  • ½ cup pea protein isolate powder (or another plain protein powder or sub oat flour)**
  • ¼ cup cocoa powder
  • ¼ cup ground flaxseed (or ⅓ cup of additional rolled oats)
  • 1 cup water (or milk)
  • ⅓ cup melted honey (or maple syrup)***
  • ½ cup almond butter
  • 2 eggs
  • ½ teaspoon baking powder (optional)
  • ¼ teaspoon salt
US Customary - Metric

Instructions

  • Preheat the oven to 350 °F.
  • In your baking pan, mix together all of the ingredients until well combined.
    1 and ⅓ cups large flake rolled oats, ½ cup pea protein isolate powder, ¼ cup cocoa powder, ¼ cup ground flaxseed, 1 cup water, ⅓ cup melted honey, ½ cup almond butter, 2 eggs, ¼ teaspoon salt
    Baked oatmeal batter mixed together in a baking pan.
  • Bake for 22-25 minutes until the center appears set.
    Baked oatmeal in a dish.
  • Slice and enjoy! It is delicious topped with nut butter, berries, Greek yogurt and more.

Notes

Make Ahead and Leftovers: Baked brownie oatmeal can be stored at room temperature for up to 1 day, in the refrigerator for up to 4 days or frozen for up to 3 months.
Enjoy cold or reheat in the microwave or oven at 350 F for 5-10 minutes.
*Oats: I prefer the texture with large flake (old fashioned) rolled oats but instant or quick oats should both work as well.
**Protein Powder: I have tested this recipe with pea and rice proteins but suspect that it should work fine with most plain protein powders. If you choose a sweetened/flavored powder, you will likely need to adjust the cocoa and sweetener and I haven't tested that. 
If you prefer to make it without protein powder, you can use oat flour instead. Simply pulse ⅔ cup of rolled oats in a blender until powdery. 
***Sweetener: The honey can be increased to ½ cup for a sweeter baked oatmeal or decreased to ¼ cup for a less sweet option.

Nutrition

Calories: 557kcal | Carbohydrates: 58g | Protein: 27g | Fat: 28g | Saturated Fat: 3g | Polyunsaturated Fat: 8g | Monounsaturated Fat: 13g | Cholesterol: 93mg | Sodium: 324mg | Potassium: 563mg | Fiber: 11g | Sugar: 25g | Vitamin A: 130IU | Vitamin C: 0.2mg | Calcium: 182mg | Iron: 7mg

Nutrition Note: Nutritional information is estimated using an online calculator and accuracy is not guaranteed. Remember food is more than numbers and this info is intended as a support.

Tried this recipe?Please comment and tell me what you thought!

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Comments

  1. Marie says

    September 17, 2025 at 5:43 pm

    5 stars
    This turned out so good! I love that it doesn't dirty any extra dishes to mix and how well the leftovers tasted.

    Reply

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Picture of Janessa.

Hi, I'm Janessa!

I develop easy, balanced breakfast ideas that you can make quickly or prep ahead for busy mornings.

If you’re a working professional (or just a busy person) looking for healthy, satisfying breakfasts, you are in the right place!

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