With hand mixer, blend cheddar cheese, cream cheese, mayonnaise, pimentos, garlic powder, onion powder, bacon pieces and salt and pepper, to taste, until smooth; set aside.
Heat oven to 400 F.
Thaw then bake pastry shells 15 minutes.
Remove tops and set aside. Spoon pimento cheese mixture into each shell.
Place dab of pimento cheese mixture on tops for smaller appetizers.
Notes
Notes: Pimento cheese mixture can be made in advance and kept in refrigerator up to 5 days before using. Recipe can be halved or doubled depending on needs.