In medium bowl, place Bisquick mix. In 2-cup measuring cup, beat buttermilk, eggs, 2 tablespoons syrup and the vanilla with whisk. Pour over Bisquick mix. Add up to 2 more tablespoons maple syrup if more maple flavor is desired. Stir in one-third of the crumbled bacon. Divide batter among muffin cups. Sprinkle with additional bacon, reserving some for garnish.