Portabella Pesto Toasts

Heat broiler. Cut mushrooms into 1/4-inch thick slices. Melt 2 tablespoons butter in large skillet until sizzling; add mushrooms and garlic powder. Cook over medium-high heat, stirring occasionally, until tender (about 5 minutes). Remove from heat. Set aside.

Spread 1 side of each bread slice with remaining butter. Place, buttered-side up, onto ungreased baking sheet. Broil 4 to 6 inches from heat until lightly toasted (about 30 seconds). Remove from broiler.

Turn bread slices over. Spread untoasted sides evenly with pesto, spreading to completely cover bread slices. Top evenly with mushrooms and cheese. Continue broiling until cheese is melted (2-3 minutes). Serve immediately.