Fresh Blueberry Coffee Cake

Step 1 -Preheat the oven to 350 degrees F.

Step 2 -Grease a 9x9-inch square baking pan with cooking spray.

Step 3 -In a large bowl, add 2 cups of the flour, 1/2 cup of the granulated sugar, the baking powder, and the salt and whisk to combine.

Step 4 -In a small bowl, cut 1/4 cup of the softened butter into small pieces.

Step 5 -Add the soft butter pieces to the flour mixture and toss to combine.

Step 6 -Add the egg, the milk, and the lemon zest to the flour mixture and mix until well-combined.

Step 7 -Add the blueberries to the batter and using a rubber spatula, gently fold to combine.

Step 8 -Add the batter to the prepared baking pan and spread it out evenly.

Step 9 -In a food processor, add the remaining sugar, the remaining flour, the walnuts, the cinnamon, and the remaining cold butter and cover the food processor.

Step 10 -Pulse until the mixture resembles small crumbs.

Step 11 -Add the topping mixture evenly over top of the batter in the baking pan.

Step 12 -Bake until a toothpick inserted into the center of the cake comes out with only a few moist crumbs attached, about 40-45 minutes.

Step 13 -Slice and serve.