Place the bread on a flat work surface. Spread 1 tablespoon of butter evenly over one side of each bread slice. Warm a skillet over medium heat for 3 to 5 minutes.
Layer each sandwich as follows: Slice of bread (butter side down), 1/2 cup shredded cheddar-jack, 2 tomato slices, 1/2 cup shredded provolone and slice of bread (butter side up).
Place the sandwiches onto the hot skillet. Cook on each side for approximately 3 to 4 minutes, or until the bottom layer of cheese begins to melt around the edges. Cut in half and serve!