Ingredients

2 cups all-purpose flour

2 teaspoons baking powder

1/2 teaspoon baking soda

1/2 teaspoon salt

2 tablespoons granulated sugar

2 large eggs

1 3/4 cups milk

1/4 cup pure maple syrup

1/4 cup unsalted butter (melted)

1 teaspoon vanilla extract

1 1/2 cups fresh or frozen blueberries

2 tablespoons unsalted butter (melted, for streusel)

1/4 cup brown sugar

1/4 cup all-purpose flour (for streusel)

1/2 teaspoon ground cinnamon

Instructions

Step 1: Grease a 9×13-inch baking dish with butter or nonstick spray.

Step 2: In a large bowl, whisk together the flour, baking powder, baking soda, salt, and granulated sugar.

Step 3: In a separate bowl, whisk the eggs, milk, maple syrup, melted butter, and vanilla extract until smooth.

Step 4: Pour the wet ingredients into the dry ingredients and stir gently until just combined. A few lumps are okay; avoid overmixing.

Step 5: Fold in the blueberries carefully. If using frozen, add them straight from the freezer.

Step 6: Pour the batter evenly into the prepared baking dish.

Step 7: Cover tightly with plastic wrap or foil and refrigerate for at least 6–8 hours or overnight.

Step 8: When ready to bake, remove the casserole from the refrigerator and let sit at room temperature for 20–30 minutes. Preheat the oven to 350°F (175°C).

Step 9: To make the streusel, mix melted butter, brown sugar, flour, and cinnamon in a small bowl until crumbly. Sprinkle evenly over the top of the casserole.

Step 10: Bake for 35–45 minutes or until golden brown and a toothpick inserted in the center comes out clean.

Step 11: Let the casserole cool for 10 minutes before slicing. Serve warm with maple syrup or a dusting of powdered sugar.

Tips & Variations

Use fresh blueberries if possible for a burst of flavor, but frozen works well too—no need to thaw.

For a dairy-free option, substitute milk with almond or oat milk and use a plant-based butter alternative.

Add chopped nuts like pecans or walnuts to the streusel for extra crunch.

Stir in a teaspoon of lemon zest to the batter for a bright, citrusy note.

FAQs

Can I use frozen blueberries directly in the casserole?

Yes, frozen blueberries can be added straight from the freezer without thawing. This helps prevent the batter from becoming too watery.

Is it necessary to refrigerate overnight?

While you can bake the casserole immediately, refrigerating overnight allows the flavors to meld and the batter to thicken, resulting in a better texture and ease of preparation on busy mornings.