Mini Gingerbread Cakes with Cream Cheese Frosting

Name: Mini Gingerbread Cakes with Cream Cheese Frosting
Ingredients: 2 cups all purpose flour; 1 1/2 teaspoons baking powder; 1 1/4 teaspoons ground cinnamon; 3/4 teaspoon ground ginger; 1/2 teaspoon salt; 1 cup (packed) dark brown sugar; 1/2 cup (1 stick) unsalted butter, room temperature; 2 large eggs; 3/4 cup mild-flavored (light) molasses; 1/4 cup plain yogurt; 12 ounces Philadelphia-brand cream cheese, room temperature; 1 1/2 cups powdered sugar; 1/2 cup (1 stick) unsalted butter; Thinly sliced kumquats (for garnish); Chopped or sliced crystallized ginger (for garnish); 4 mini muffin pans; 48 13/4x1-inch paper liners