You are going to love the simplicity of this recipe. Dry ingredients, check! Wet ingredients, check! Mix and bake!
You can make this with whole wheat flour but you must use whole wheat pastry flour. Otherwise, you will have a dense cake.
To prevent the blueberries from sinking to the bottom, give them a quick toss in 2 Tablespoons of flour. Coating them with flour will prevent them from sinking to the bottom.
Quick tip: Measure all your dry and wet ingredients and place them in separate bowls. Refrigerate your wet ingredients (minus the butter, you should leave that out on the counter) and in the morning, all you have to do is quickly mix the batter, pour, sprinkle your topping and bake!