Layer cheese and pepperoni on one piece of bread.
Top with 1 layer each of red peppers, artichokes, black olives, banana peppers, and fresh spinach (amounts according to taste).
Top with second piece of bread.
Melt 1/2 Tbsp. butter in a small skillet. Grill sandwich over medium heat on one side, then melt remaining 1/2 Tbsp. butter and flip sandwich to grill on second side.