A very rich and chocolaty muffin, this is perfect with a cup of hot tea or coffee or as a snack. I use semi-sweet chips myself because the milk chocolate makes for a very sweet muffin; just sub a bag of semi sweet chips.
COMBINE flour, brown sugar, cinnamon and 2 tablespoons melted butter butter in small bowl with fork until mixture resembles coarse crumbs; stir in pecans.
PREHEAT oven to 375° F; grease or paper-line 12 muffin cups.
COMBINE 1 cup morsels, milk and 3 tablespoons butter in a microwave safe bowl; microwave on full power for about 60 seconds and then stir until morsels are melted and mixture is smooth; if not fully melted, put back in for 10 second intervals.
COMBINE flour, sugar, baking powder, cinnamon, pecans and remaining morsels in large bowl.
COMBINE egg, vanilla extract and melted morsel mixture in small bowl; stir into flour mixture just until moistened.
Spoon into prepared muffin cups, filling 2/3 full then sprinkle with Topping.
BAKE for 20 to 25 minutes then cool in pan for 5 minutes; remove to wire rack to cool completely.