1. Preheat oven to 400°.
2. Arrange the pierogies in an 11 x 7-inch glass baking dish coated with cooking spray. Cook bacon in a saucepan over medium heat until crisp; remove from pan. Set aside.
3. Add garlic to drippings in pan, and cook for 30 seconds, stirring constantly. Add 1/3 cup cream cheese to pan, and cook for 1 minute or until cream cheese begins to melt, stirring frequently. Gradually add chicken broth to pan, stirring with a whisk until smooth. Pour the cream cheese mixture evenly over pierogies. Top evenly with 1/2 cup cheddar cheese. Bake at 400° for 20 minutes or until bubbly and thoroughly heated. Remove from oven, and sprinkle with bacon, green onions, tomato, and pepper.