Step 1

Preheat the oven to 375°F and spray an 8x10 inch baking dish with cooking spray.

Step 2

Line it with parchment paper to make things to clean afterward.

Step 3

In a large mixing bowl, combine oats, baking powder, Cinnamon (if using), lemon zest, and salt.

Step 4

In another bowl whisk eggs, milk, maple syrup or honey, lemon juice, oil, and vanilla extract.

Step 5

Next, pour the liquid mixture into the oats. Gently fold to fully combine.

Step 6

Stir in 3/4 cup of the blueberries and fold again.

Step 7

Now pour the mixture into the prepared baking dish, using a spatula or the back of a spoon, hard-pack the mixture to create an even smooth top. Add the rest of the blueberrues on top.

Step 8

Bake for 25-30 minutes or until the topping smells toasty and looks golden brown.

Step 9

Place the pan on a wire rack to cool completely.

Step 10

Divide into 6 squares, garnish with the remaining fresh berries on top, and serve with plain yogurt.