Line a 9x9x2-inch pan with foil, extending the foil over edges of pan. Butter foil; set pan aside.
In a large microwave-safe bowl microwave marshmallows and 3 tablespoons butter on 100 percent power (high) for 1 to 2 minutes or until butter is melted. Stir in coconut flavoring. Stir in coconut, cereal, and almonds. Cool slightly. Gently fold in chocolate pieces.
Press mixture lightly onto the bottom of the prepared pan. Let stand about 1 hour or until set. Using the edges of the foil, lift uncut bars out of pan. Cut into bars.