Heat oven to 350°F. In small bowl, mix 1 cup Bisquick mix and 2 tablespoons powdered sugar. Cut in butter, using pastry blender (or pulling 2 table knives through mixture in opposite directions), until crumbly. Press in ungreased 8-inch square pan.
2 Bake uncovered about 10 minutes or until light brown. Meanwhile, in small bowl, mix all remaining bar ingredients. Pour coconut mixture over baked layer.
3 Bake about 25 minutes longer or until set and golden brown. Loosen edges from sides of pan while warm.
4 In small bowl, stir lemon glaze ingredients until smooth; spread over bars. Cool completely, about 1 hour. For bars, cut into 4 rows by 4 rows.