Turkey and Bacon Panini with Chipotle Mayonnaise

Step 1
Cook bacon in a large, deep skillet over medium-high heat until evenly browned, about 10 minutes. Drain on a paper towel-lined plate.

Step 2
While the bacon is cooking, melt butter in a large skillet over medium heat. Add onion and cook, stirring occasionally, until soft and translucent, 7 to 10 minutes, adding garlic for the last minute. Stir in spinach and cook until wilted, about 3 minutes. Remove from the heat.

Step 3
Preheat a panini press according to the manufacturer's instructions.

Step 4
Stir mayonnaise, chipotle peppers, and adobo sauce together in a small bowl. Spread mixture over 4 slices of focaccia bread, then top each slice with provolone, turkey, two slices bacon, spinach mixture, and remaining bread slices.

Step 5
Cook sandwiches in the preheated panini press until crispy and golden brown, about 5 minutes each.