Vidalia Onion Cornbread

Ingredients:
1/4 cup (1/2 stick) butter
1 large Vidalia onion, chopped
1 (8-ounce) package cornbread/muffin mix
1 egg, beaten
1/3 cup whole milk
1 cup sour cream
1 cup grated sharp Cheddar, divided
1/4 teaspoon salt

Directions:
1. Preheat the oven to 450 degrees.
2. Spray an 8-inch square baking pan with vegetable oil cooking spray.
3. In a medium saucepan, melt the butter and saute the onion until tender, but not browned, for about 3 minutes. Remove the pan from the heat and add the muffin mix, egg, milk, sour cream, 1/2 cup of the cheese, and the salt.
4. Stir to combine. Pour into the prepared pan and top with the remaining 1/2 cup cheese.
5. Bake for 30 minutes, until set and a toothpick inserted into the center of the cornbread comes out clean.
6. Allow to cool slightly before cutting into squares.