Hearty BLT Sandwiches

Name: Hearty BLT Sandwiches
Ingredients: 4 ounces bacon, thinly sliced (4 strips); 8 ounces Tuscan kale, thinly sliced (about 6 cups sliced); 1 tablespoon apple cider vinegar; Freshly ground black pepper; Olive oil cooking spray, for the baking sheet; 1 small acorn squash, halved, seeded and cut into 1/2-inch-thick pieces; 1/4 teaspoon garlic salt; 1/4 teaspoon freshly cracked black pepper; 1/4 teaspoon Spanish sweet paprika; 1/8 teaspoon ground cinnamon; 8 slices bread; 4 slices American cheese; 4 slices pepper jack cheese; 4 tablespoons salted butter, at room temperature