Ingredients
1/2 cup butter, softened1 cup sugar2 large eggs, room temperature1 cup plain yogurt1 teaspoon vanilla extract2 cups all-purpose flour1 teaspoon baking soda1/2 teaspoon baking powder1/2 teaspoon salt3/4 cup semisweet chocolate chipsTOPPING:1/4 cup semisweet chocolate chips2 tablespoons brown sugar2 tablespoons chopped walnuts, optional1 teaspoon ground cinnamon
Preparation
In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in yogurt and vanilla. Combine the flour, baking soda, baking powder and salt; add to the creamed mixture just until moistened. Fold in chocolate chips. Fill 12 paper-lined muffin cups two-thirds full.
Combine the topping ingredients; sprinkle over batter. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool for 5 minutes before removing from pan to wire rack. Serve warm.
