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Blackberry Baked Oatmeal Recipe for Summer Brunch

This Blackberry Baked Oatmeal is simple to make and has quickly become a family favorite. Juicy blackberries and pure maple syrup brighten the oats, creating a naturally sweet and comforting bake. It only takes about 10 minutes to prepare, then 35 minutes to bake, making it an easy option for a busy morning, meal prep, or a portable snack kids enjoy.

Blackberry baked oatmeal on a blue plate with banana slices and blackberries.

I began eating more oats while breastfeeding because oats can help support milk supply, and I quickly fell in love with the texture and convenience. I often slice a bar and enjoy it with fruit for breakfast. If you like this bake, you might also enjoy other oat-based recipes such as Pumpkin Baked Oatmeal, Zucchini Oatmeal Bars, Strawberry Oatmeal Bars, Cranberry Oatmeal Bars, and Apple Oatmeal Bake.

Why I Love This Recipe

  • Blackberries add a juicy, tart-sweet burst. If you have extra berries, they work beautifully in crisps and muffins as well.
  • This recipe is naturally gluten free, dairy free, soy free, and nut free when you choose appropriate ingredients.
  • You can mix the ingredients ahead of time and bake when you’re ready, which is great for mornings or entertaining.
  • It’s ideal for weekday breakfasts, holiday brunches, or casual hosting.
  • If fresh blackberries aren’t available, other fresh fruit can be substituted—just avoid frozen berries, which can make the bake watery.

Recipe Ingredients

Oats, bananas, blackberries, maple syrup, cinnamon, milk and an egg laid out on the counter in glass clear bowls.
  • Steel-cut oats – I recommend steel-cut oats (gluten-free if needed). Do not substitute quick, instant, or rolled oats for this recipe.
  • Fresh blackberries – Use fresh, ripe berries. Frozen blackberries will add extra moisture and can make the bake soggy.
  • Cinnamon – For warm flavor.
  • Banana – Mashed banana adds flavor and helps bind the mixture.
  • Milk & eggs – These keep the bake moist and help it set. Use dairy-free milk if you prefer.
  • Maple syrup – Natural sweetener. Honey or agave can be used as alternatives.
  • Cooking oil spray – To prevent sticking; parchment paper also works.

See the recipe card below for exact measurements.

Recipe Substitutions and Variations

  • Maple syrup – Swap for honey or agave if desired.
  • Milk – Dairy-free milks like oat, soy, coconut, or almond milk work well.
  • Banana – You can replace banana with pumpkin puree for a different flavor profile.
  • Toppings – Add banana slices, chia seeds, extra berries, pumpkin seeds, nut butters, coconut sugar, or a drizzle of maple syrup after reheating.

This recipe hasn’t been tested with other major substitutions—if you try something new, share your results in the comments.

Recipe Instructions

Blackberry oatmeal ingredients in a stainless bowl.
Step #1: Preheat the oven to 350°F (175°C). Mash the banana and combine all wet ingredients in a large bowl. In a separate bowl, mix the dry ingredients, then combine them with the wet mixture.
Mixed blackberry oatmeal ingredients in a bowl.
Step #2: Stir thoroughly until evenly combined.
Oatmeal bake spread out in a white casserole dish.
Step #3: Spray a 9 x 13-inch pan with cooking spray or line with parchment. Spread the oat mixture evenly in the pan and bake for about 35 minutes, until golden on top and set in the center.

Recipe Tips and Tricks

  • Tip #1: Baking time will vary with pan size and depth. Thinner layers bake faster; thicker layers require more time.
  • Tip #2: The oat bake is done when the top is golden brown and the center is set. Allow it to cool slightly before slicing for cleaner bars.

Recipe FAQs

How should I serve this recipe?

Serve warm straight from the oven or chilled from the fridge. It pairs nicely with fruit or alongside savory egg muffins for a balanced meal.

How long does this recipe last?

Store in an airtight container in the refrigerator for up to 5 days. At room temperature, keep it covered and consume within 1–2 days.

Oatmeal bake in a white casserole dish with blackberries and bananas on top.

Other Gluten Free Oatmeal Recipes You Will Love

  • Zucchini Oatmeal Bars
  • Strawberry Oatmeal Bars
  • Cranberry Oatmeal Bars (Gluten Free)
  • Apple Oatmeal Bake (Gluten Free)

Are you interested in a list of my go-to healthy alternatives?

Download a free guide for healthy swaps and meal ideas.

Download the guide.
Blackberry baked oatmeal on a blue plate with banana slices and blackberries.

Blackberry Baked Oatmeal

Course Breakfast
Cuisine American
Diet Gluten Free
Prep Time 10 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings 6 servings
Author Allianna Moximchalk

278kcal

Cost $5

Equipment

  • 9 by 13 casserole dish

Ingredients

  • 2 1/4 cups steel cut oats (gluten-free if needed)
  • 1/2 tsp cinnamon
  • 1 banana, mashed
  • 3/4 cup milk (dairy-free options work well)
  • 1 cup blackberries, washed and dried
  • Cooking oil spray or parchment for the pan

Instructions

  1. Preheat the oven to 350°F (175°C). In a large bowl, mash the banana and combine with the wet ingredients. In another bowl, stir together the oats and cinnamon, then combine with the wet mixture.
  2. Spray a 9 x 13-inch pan with cooking spray or line with parchment. Spread the oat mixture evenly in the pan, top with blackberries if desired, and bake for about 35 minutes until golden and set. Let cool slightly before slicing into bars.

Notes

Storage: Keep in an airtight container in the refrigerator for up to 5 days.
Nutrition: Nutrition information is an estimate and not guaranteed.
Servings: Yields about 6 bars.
Easy, delicious blackberry baked oatmeal that the whole family will enjoy.
Serving: 1bar
|
Calories: 278kcal
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Carbohydrates: 48 g
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Protein: 11 g
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Fat: 5 g
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