Four-Cheese Grilled Cheese Sandwich
1 teaspoon minced garlic 1 ½ tablespoons olive oil, divided, or more a… 2 cups chopped fresh spinach 2 slices Asiago cheese 2 slices Fontina cheese 2 slices mozzarella cheese 2 slices provolone cheese 2 tablespoons salted butter, softened 2 thick slices Italian bread 3 slices Roma tomato, cut lengthwise, or more… ½ cup giardiniera, drained