Grown-Up Grilled Cheese Sandwiches

slices Bacon, center-cut cooked

Garlic clove, large

Spinach, fresh leaves

thick 8 (1/4-inch-thick) slices Tomato

Vertically sliced red onion

Cooking spray

slices Pepperidge farm white bread, hearty such as

Cracker barrel white cheddar cheese, reduced-fat sharp such as