Mini Shepherds Pie

Name: Mini Shepherd's Pie
Ingredients: Nonstick cooking spray; 1 can biscuits (12) (recommended: Grands); 2 tablespoons olive oil; 1 pound ground beef; 1/2 onion, minced; 1 1/2 teaspoons salt; 1 tablespoon cracked black pepper; 1 tablespoon minced garlic; 2 tablespoons all-purpose flour; 1/2 cup beef stock; 1 cup frozen mixed vegetables; 2 tablespoons chopped fresh parsley leaves; 1 tablespoon chopped fresh rosemary leaves; 1 1/2 cups leftover mashed potatoes; 1 tablespoon granulated garlic powder; 2 tablespoons granulated onion powder; 2 cups shredded Cheddar