Heat oven to 350°F. Spray 8 regular-size muffin cups with Crisco® Original No-Stick Cooking Spray. Remove crescent dough from can, but do not unroll. Using serrated knife, cut roll of dough into 8 slices; place 1 slice in each muffin cup.
In small microwavable bowl, microwave 1 tablespoon of the butter 10 to 15 seconds or until melted. Stir in garlic powder and garlic salt. Brush butter mixture onto dough in each cup.
Bake 8 to 12 minutes or until light golden brown. Remove from oven. Using back of spoon, immediately press center of each round to form a cup. Set aside.
Meanwhile, in 10-inch nonstick skillet, melt remaining 1 tablespoon of butter and olive oil over medium heat. Add mushrooms and onion; cook 7 to 10 minutes, stirring frequently, or until softened. Remove from heat; stir in pepper and 1/4 cup of the sun-dried tomatoes.
Evenly divide 1/2 of the cheese cubes into each cup; top with 1 tablespoon mushroom mixture. Evenly divide remaining cheese cubes into each cup.
Bake 6 to 8 minutes or until cheese is melted. Cool in pan 5 minutes. Transfer to serving platter.
In medium bowl, combine mixed spring greens and salad dressing; toss to coat. Top each cup with salad mixture. Garnish with remaining sun-dried tomatoes. Serve warm.