Lemon Basil Cake

From Cooking with Trader Joe's.
Ingredients:
1 Package Vanilla Cake & Baking Mix (requires 2 eggs, 1 stick melted butter or 1/2 cup oil, and 1 cup cold milk)
Zest of 2 lemons, about 2 Tbsp
1/2 cup finely chopped fresh basil
blueberries (optional)
whipped cream (optional)

Preheat oven to 350 degrees.
Mix together cake batter as directed. When the batter is smooth, stir in lemon zest and basil. Spread batter in oiled 8x8-inch pan. Bake 40-43 minutes or until toothpick inserted in center comes out clean.
Cool and remove from pan. When serving slices, top with blueberries or whipped cream.
Serves 9.