Easy Cosmic Brownie Baked Oats (Protein Recipe)

These cosmic brownie baked oats are a single-serve, high-protein breakfast that tastes exactly like the Little Debbie you grew up on — fudgy chocolate oats, a Greek yogurt chocolate ganache on top, and rainbow chip sprinkles to finish it off.

These have no business being a breakfast food. But here we are and I am NOT complaining.

Cosmic brownie baked oats are a single-serving high-protein breakfast made by blending oats into a batter with cocoa powder, protein powder, and egg, baking it until it’s fudgy and cake-like, then topping it with a two-ingredient chocolate ganache and rainbow chip sprinkles. The whole thing comes together in about 30 minutes and hits 38g protein per serving.

I made these for the first time because I was OBSESSED with the blended baked oats trend and wanted something that actually tasted indulgent instead of healthy-breakfast-sad. One bite and I knew. This was the one. I’ve made them so many times since that my blender basically does it on autopilot at this point.

If chocolate for breakfast is your thing (same), you’ll also want to check out my Chocolate Lava Baked Oats and my Chocolate Zucchini Baked Oats.

What Are Cosmic Brownies?

Cosmic Brownies are the Little Debbie snack cake that basically defined the elementary school lunch era. Fudgy chocolate brownie base, thick chocolate ganache on top, and those iconic rainbow-colored candy-coated chocolate chip sprinkles. They’re chewy, rich, and exactly what you want when you need something chocolate and you need it now.

This recipe takes everything that makes a cosmic brownie a cosmic brownie and turns it into a single-serve baked oat situation with actual protein in it. Same vibes, way better macros.

Why You’ll Love This Recipe

• It tastes like dessert for breakfast. Fudgy chocolate center, ganache topping, rainbow sprinkles — this is not a sad healthy breakfast. It’s a Little Debbie situation that happens to have protein in it.
• Single serving, 30 minutes, one blender. Blend the batter, pour it into a ramekin, bake for 20–25 minutes, mix the ganache while it bakes. Done.
• Gluten free. Just use certified gluten-free oats and you’re covered — no swaps needed anywhere else.

Ingredients

The exact amounts are in the recipe card below. Here’s what you need and why each one matters:

Certified gluten-free rolled oats — blended into a fine flour. Rolled or quick oats both work. Do NOT use steel cut oats, they stay chewy and won’t give you that cakey texture.

Cocoa powder — this is where the deep chocolate flavor comes from. Don’t skip it or reduce it.

Baking powder — gives the baked oats that lift and rise so they don’t come out flat and dense.

Chocolate protein powder — my go-to is Chocolate Truffle from PEScience (code BAILEY saves you money). It adds protein AND makes the whole thing taste more like brownie batter. Worth it.

Egg — helps the oats rise and gives that cakey texture that makes baked oats different from regular oatmeal. A flax egg works too but the texture won’t be quite as fluffy.

Unsweetened almond milk — or any plant-based milk you have on hand. Oat milk, cashew milk, soy milk — all fine here.

Mini chocolate chips — for that double chocolate moment. Use dairy-free if needed.

Pinch of salt — enhances every other flavor. Don’t skip it.

Plain Greek yogurt — this gets mixed with cocoa powder and a splash of milk to make the ganache. Two-ingredient chocolate frosting, basically.

Rainbow chip sprinkles — non-negotiable. These are the cosmic brownie detail that makes the whole thing.

How to Make Cosmic Brownie Baked Oats

1. Preheat your oven to 350°F and grease a small ramekin.
2. Add oats to a high-speed blender and blend into a fine flour.
3. Add all remaining batter ingredients (cocoa powder, baking powder, protein powder, egg, almond milk, chocolate chips, salt) and blend until smooth.
4. Pour batter into the greased ramekin and bake for 20–25 minutes, until the center is just set.
5. While it bakes, mix together the Greek yogurt, cocoa powder, and a splash of almond milk in a small bowl until smooth and spreadable.
6. Let the baked oats cool for 2–3 minutes, then spread the ganache on top and finish with rainbow chip sprinkles.

Tips

• Don’t overbake. Pull it at 20 minutes if you want a fudgier center. The 25-minute mark gives you more of a set, cakey texture.
• Blend the oats first. Getting them to a fine flour before adding everything else = smoother batter = better texture. Don’t try to blend it all together at once.
• Ganache too thick? Add almond milk a splash at a time until it’s spreadable. You want it to hold its shape on top, not pour off the sides.

Substitutions

Rolled oats → quick oats: works fine. Steel cut oats do not work here.

Egg → flax egg: combine 1 tablespoon ground flaxseed with 3 tablespoons water, let sit 5 minutes. The texture will be slightly denser and won’t rise as high, but it still works.

Almond milk → any plant-based milk: oat milk, cashew milk, soy milk, coconut milk — all fine.

Chocolate protein powder → vanilla protein powder: swap it in if that’s what you have. The chocolate flavor will be slightly lighter but the ganache covers a lot of ground.

Mini chocolate chips → dark chocolate chips or white chocolate chips: use whatever you love. Dairy-free chocolate chips work perfectly.

Greek yogurt (ganache) → coconut yogurt: works great for a dairy-free version. Same ratio, same method.

Storage

Store leftover baked oats in an airtight container in the fridge for up to 4 days. Reheat in the microwave for 20–30 seconds. The ganache softens slightly when reheated which is honestly not a complaint.

These don’t freeze well because of the ganache layer — the texture gets weird after thawing. Make it fresh for best results, which honestly isn’t hard since it’s a single serving anyway.

Frequently Asked Questions

What are cosmic brownie baked oats? Cosmic brownie baked oats are a single-serving high-protein breakfast made by blending oats into a batter with cocoa powder and protein powder, baking it until fudgy, and topping it with a chocolate Greek yogurt ganache and rainbow chip sprinkles — inspired by the Little Debbie Cosmic Brownie.

Are cosmic brownie baked oats gluten free? Yes, as long as you use certified gluten-free oats. Oats are naturally gluten free but can be cross-contaminated during processing, so the certified gluten-free label matters if you’re celiac or gluten sensitive.

Can I make baked oats without protein powder? You can omit the protein powder and replace it with an equal amount of oat flour or a tablespoon of cocoa powder for extra chocolate flavor. The texture will be slightly less rich and the protein count will drop, but the recipe still works.

How long do baked oats last? Stored in an airtight container in the fridge, these cosmic brownie baked oats last up to 4 days. Reheat in the microwave for 20–30 seconds before eating.

Other Baked Oatmeal Recipes

• Tiktok Baked Oats (Birthday Cake)
• Biscoff Baked Oats
• Cinnamon Roll Baked Oatmeal
• Lemon Poppy Seed Baked Oats
• Banana Bread Baked Oats
• Sugar Cookie Baked Oats

If you make these cosmic brownie baked oats, I need to know. Leave a star rating below so other people can find them, and tag me on Instagram @basicswithbails or use #basicswithbails so I can see your version. The ganache photos alone are always worth it.