Frozen Berry Cake

Preheat oven to 350 F.
Butter a 9-inch cake pan or an 8x8 square baking dish.
butter for pan
Combine flour, sugar, baking powder, and salt in a medium-size mixing bowl.
1 cup all-purpose flour, 1/4 cup sugar, 1 tsp baking powder, 1/2 tsp salt
Add beaten eggs, vanilla, butter, lemon zest, and yogurt. Mix until well combined.
3 tbsp butter, 2 eggs, 1 tsp vanilla extract, 1 tbsp lemon zest, 1 cup plain greek yogurt
In a separate bowl, toss 1 tsp flour with the frozen berries. Do your best to coat all the berries.
1 tsp all-purpose flour, 1.5 cup frozen berries
Spoon and spread half of the batter into the baking dish and top with half of the floured berries.
Top berries with the remaining batter (spread), and then add the rest of the berries on top of that.
Bake, uncovered for 35-40 minutes, or until a toothpick inserted into the middle comes out clean.
Top fully-cooled cake with powdered sugar if desired.
1 tsp powdered sugar