Easy Baked Oatmeal Squares You Can Prep Once and Eat All Week

Baked oatmeal squares are one of those breakfasts that make mornings feel calmer. I mix them up in one bowl, bake them in a 9x13, and suddenly we have warm, wholesome breakfasts ready for the week, no drive-thru and no packaged junk. These blueberry oatmeal squares are lightly sweet, hearty, and easy to customize, which makes them perfect for a busy homeschool house. Serve them as-is, or top with Greek yogurt, cottage cheese, and extra berries for a breakfast that truly sticks with everyone until lunch.

Ingredients
Dry
6 cups rolled oats (old-fashioned)
2 tsp baking powder
1 1/2 tsp cinnamon
1 tsp fine sea salt

Wet
6 large eggs
4 cups milk (or half milk, half water)
1/2 cup melted butter (or melted coconut oil)
1/2 cup maple syrup or honey (see notes for less)
2 tbsp vanilla extract

Mix-ins (choose one)
Blueberry: 2 cups blueberries (fresh or frozen)
Apple-cinnamon: 3 cups peeled diced apples + extra cinnamon
Banana: 2–3 mashed ripe bananas (reduce milk by 1/2 cup)

Optional (for extra richness)
1/2–1 cup chocolate chips or chopped pecans/walnuts

Instructions: 
1. Preheat oven to 350°F. Grease a 9x13 dish (butter or coconut oil).
2. In a large bowl, mix oats, baking powder, cinnamon, and salt.
3. In another bowl, whisk eggs, milk, melted butter, maple syrup/honey, and vanilla.
4. Pour wet into dry and stir well. Fold in your fruit/mix-ins.
5. Pour into the pan and smooth the top.
6. Bake 30–40 minutes until set in the center and lightly golden.
7. Cool 10–15 minutes for softer squares, or 30+ minutes for cleaner slices.
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