Cherry Blueberry Breakfast Cake

Recently I had to stay in for a few days and keep an eye on our dog who was under the weather. Daughter and I had planned to go to breakfast, but we made the best of ity. Instead, she made a big pot of coffee and I made this breakfast cake. What a treat, for both of us!
serves 4-6
Ingredients-
2 cups unbleached flour
2 tsp baking powder
1 tsp kosher salt
1 cup fresh blueberries
½ cup unsalted butter, room temperature
zest from 1 lemon
3/4 cup sugar
1 egg, let sit at room temperature
1 tsp. vanilla
1/2 cup cut up sweet cherries
1 container blueberry yogurt
½ cup buttermilk
1 tsp brown sugar

Mix dry ingredients and add blueberries, toss to coat.

In Mixer blend butter and sugar and beat well. Add egg, vanilla and lemon zest, mix well. Add yogurt and buttermilk, then add dry ingredients to wet in mixer and beat on low until just blended.Mix in cherries by hand. Pour batter in a buttered 9" casserole or glass baking dish. Sprinkle the brown sugar on top before baking. Bake in preheated 350 degree oven for 25-30 min until toothpick comes out clean and top is browned.