Brownie Baked Oatmeal Squares

Category: Indulgent Dessert Recipes

Bake a pan of rich, chocolatey oatmeal bars using mashed banana, cocoa, and rolled oats for a satisfying start to your day. Natural peanut butter and a hint of maple syrup add depth and sweetness without overwhelming the wholesome texture of the oats. Simply whisk all the ingredients together, bake until set at 350 F, and let cool before slicing. Serve these soft, fudgy bars warm or chilled—flavors deepen overnight. Perfect for batch baking and easy to customize with chocolate chips or allergy-friendly substitutions. Enjoy a treat that blends dessert-like taste with nourishing ingredients!

Ranah
Updated on Thu, 29 May 2025 22:45:44 GMT
A close up of a brownie with a strawberry on top. Save
A close up of a brownie with a strawberry on top. | noorbakes.com

Brownie baked oatmeal is my favorite solution for mornings when I want something chocolatey but wholesome. This cozy breakfast tastes just like a fudgy brownie yet keeps you full and fueled. Whether packed into lunchboxes or eaten straight from the pan, it turns everyday oats into something special.

When my kids smelled the chocolatey aroma wafting from the oven the first time I made this, they gathered in the kitchen before it even cooled. Now it is our go-to breakfast for busy school mornings and lazy weekends.

Ingredients

  • Peanut butter or allergy friendly substitute: adds healthy fats and a creamy texture look for natural peanut butter without extra oil or sugar
  • Mashed banana: brings sweetness and moisture use ripe bananas with lots of brown spots for best flavor
  • Milk of choice or water: helps bind everything together dairy or plant milks work equally well choose unsweetened for less sugar
  • Pure maple syrup or honey or agave: adds natural sweetness for richness in flavor opt for real maple syrup if possible
  • Pure vanilla extract: gives warmth and depth select pure rather than imitation extract for best results
  • Rolled oats: provide the hearty base use old fashioned rolled oats not instant for texture
  • Cocoa powder or chocolate protein powder: delivers a deep chocolate richness choose unsweetened cocoa for a classic chocolate taste or chocolate protein for extra protein
  • Salt: balances flavors and brings out the sweetness sea salt or Kosher salt works well
  • Chocolate chips (optional): for melty chocolate pockets I like to use dark chips or mini chips for even distribution

Step-by-Step Instructions

Prep the pan:
Line or grease a nine by thirteen inch pan thoroughly so the oatmeal lifts out easily after baking
Mix the wet ingredients:
Whisk peanut butter mashed banana milk maple syrup and vanilla extract in a large bowl until smooth and fully combined
Add the dry ingredients:
Stir in rolled oats cocoa powder and salt mixing gently until well incorporated If using chocolate chips fold them in now
Bake the oatmeal:
Pour the batter into your prepared pan Spreading it evenly to all the corners is key Bake in a three hundred fifty degree oven for thirty five minutes The center should be set and slightly puffed
Cool and serve:
Let the oatmeal rest in the pan until mostly cool for cleaner slices Serve bars warm or cold and enjoy with fresh fruit or almond butter The flavor deepens and improves if you let them sit overnight
A slice of brownie baked oatmeal with a strawberry on top. Save
A slice of brownie baked oatmeal with a strawberry on top. | noorbakes.com

I always look forward to adding those chocolate chips on top before baking Turning them melty and gooey never fails to get my family around the table together The bananas also remind me of my grandmother who always had ripe ones ready for baking

Storage Tips

Store leftover brownie baked oatmeal in an airtight container in the fridge for up to five days Squares also freeze well individually I wrap them in wax paper for quick grab and go snacks Defrost briefly in the microwave or let sit at room temperature before serving

Ingredient Substitutions

For nut free oatmeal swap peanut butter for sunflower seed butter Use honey instead of maple syrup for a slightly floral sweetness Any plant milk will do for dairy free versions I have even used applesauce instead of banana for a different flavor without banana

A slice of brownie baked oatmeal with a strawberry on top. Save
A slice of brownie baked oatmeal with a strawberry on top. | noorbakes.com

Serving Suggestions

Top each slice with Greek yogurt and berries for extra protein A dollop of nut butter or a sprinkle of coconut takes it firmly into dessert territory Sometimes I break warm bars into a bowl and pour over a little warm milk

A Touch of Background

Baked oatmeal is an old fashioned breakfast dish from the American Midwest where oats were plentiful Adding cocoa powder was a game changer for my family Now it brings a taste of dessert to weekday mornings and is always the first thing gone at potluck brunches

Recipe FAQs

→ Can I make this oatmeal without bananas?

Yes, you can substitute the 3 cups of mashed banana with a banana-free alternative. Try using unsweetened applesauce or pumpkin puree in equal measure to maintain the moisture and texture.

→ Is it possible to use a different nut butter?

Absolutely! Use any nut or seed butter, such as almond butter or sunflower seed butter, to suit allergies or preferences.

→ What type of milk works best?

You may use any milk, including dairy or plant-based options like almond, oat, or soy milk. Even water can be used for a lighter result.

→ Can I add extra chocolate chips?

Of course. Mix in up to half a cup of chocolate chips for a more decadent touch, or sprinkle some on top before baking.

→ How should I store these oatmeal bars?

Once cooled, keep the bars in an airtight container at room temperature for up to 2 days, or refrigerate for 4-5 days. They also freeze well for longer storage.

Brownie Baked Oatmeal Bars

Chocolate oatmeal bars with banana, peanut butter, and cocoa. Wholesome, easy, and great for breakfast or snack time.

Prep Time
~
Cooking Time
35 mins
Overall Time
35 mins
By: Noor

Category: Desserts

Skill Level: Beginner-Friendly

Cuisine Type: American

Yields: 12 bars or 18 squares

Dietary Preferences: Vegan-Friendly, Vegetarian-Friendly, Lactose-Free

Ingredients

01 1/3 cup peanut butter or allergy-friendly substitute
02 3 cups mashed banana
03 1 cup milk of choice or water
04 1/4 cup pure maple syrup or honey or agave
05 2 tsp pure vanilla extract
06 3 cups rolled oats
07 1/2 cup cocoa powder or chocolate protein powder
08 1 tsp salt
09 1/2 cup chocolate chips

Steps to Follow

Step 01

Preheat oven to 350°F (175°C). Line or grease a 9x13 inch pan.

Step 02

Whisk all ingredients in a large bowl to form a batter.

Step 03

Smooth the batter into the prepared pan and bake for 35 minutes.

Step 04

Let cool after baking, then serve hot or cold. For a richer flavor, allow to rest overnight.

Additional Notes

  1. Use leftover oats to make Black Bean Brownies.

Required Tools

  • Oven
  • 9x13 inch pan
  • Mixing bowl
  • Whisk

Allergen Information

Double-check all ingredients for potential allergens and consult a health professional if needed.
  • Peanuts (if using peanut butter)
  • Chocolate

Nutritional Information (Per Serving)

These details are approximate and can't replace professional advice.
  • Calories: 100
  • Fats: ~
  • Carbohydrates: ~
  • Proteins: ~