Spread Terrapin Ridge Farms Pumpkin Honey Mustard evenly on two slices of the bread.
Divide cheddar cheese evenly over the two slices with the mustard.
Break bacon slices in half and place two halves over the slices with the cheddar cheese.
Sprinkle Monterrey Jack cheese over the bacon and top with remaining bread slice.
Spread 1 Tbsp butter over top of sandwiches. Melt remaining 1 Tbsp of butter in cast iron skillet over medium heat.
Place sandwiches in skillet and cook over medium-low heat for 5 minutes or until cheese begins to melt and bread begins to toast.
Carefully flip sandwiches and cook on second side for another 5 minutes or until cheese is fully melted and bread is toasted.
The idea is to cook low and slow until the cheese is melted without burning the bread.
Remove from heat. Slice in half and eat!