There are sandwiches, and there are SANDWICHES!!! You see how we bolded the word "sandwich" and added exclamations? That's because when you taste the bold flavor of SPAM® Classic in this sandwich, you're going to exclaim, "WOW!!!"
Heat oven to 350°F.
Cut thin slice from top of each bun. Remove center from each bun, leaving 1/2-inch wall.
In bowl, combine remaining ingredients; mix well. Spoon filling evenly into buns, pressing into buns. Cover with tops of buns.
Wrap each sandwich tightly in aluminum foil. Bake 20 minutes or until heated thoroughly and cheese is melted.