Combine first 5 ingredients in a large bowl; set aside.
Mix together milk, coffee and egg; stir into flour mixture. Stir in butter and vanilla; mix well. Stir in chocolate chips.
Spoon batter into paper-lined or greased muffin cups, filling 2/3 full.
Bake at 375 degrees for 17 to 20 minutes, until a toothpick tests clean.
Cool in pan for 5 minutes; transfer to a wire rack to finish cooling.