Step 1

Preheat oven to 350 F.

Step 2

Butter a 9-inch cake pan or an 8x8 square baking dish.

Step 3

Combine flour, sugar, baking powder, and salt in a medium-size mixing bowl.

Step 4

Add beaten eggs, vanilla, butter, lemon zest, and yogurt. Mix until well combined.

Step 5

In a separate bowl, toss 1 tsp flour with the frozen berries. Do your best to coat all the berries.

Step 6

Spoon and spread half of the batter into the baking dish and top with half of the floured berries.

Step 7

Top berries with the remaining batter (spread), and then add the rest of the berries on top of that.

Step 8

Bake, uncovered for 35-40 minutes, or until a toothpick inserted into the middle comes out clean.

Step 9

Top fully-cooled cake with powdered sugar if desired.