Step 1

Preheat oven to 400 degrees F. Coat an 8-inch square baking dish with cooking spray.

Step 2

In a large bowl, whisk sour cream, milk, egg, and butter. Add remaining ingredients and whisk until mixed. Pour batter into baking dish.

Step 3

Bake 25 to 30 minutes or until a wooden toothpick inserted in center comes out clean. Let cool 15 minutes, then cut into squares and serve warm.