Spread roll bottoms with mayonnaise.

Layer turkey, bacon, a few diced pimentos, and cheese. Replace tops.

Arrange sandwiches in a single layer in a greased 9-inch-square baking pan.

In a small skillet, melt butter over medium heat. Add onion; cook and stir 1-2 minutes or until tender.

Whisk in the brown sugar, Worcestershire sauce, and garlic powder. Continue whisking until brown sugar is dissolved.

Pour butter sauce over sandwiches.

Cover with aluminum foil and refrigerate for several hours.

Preheat oven to 350°F. Bake, covered, 25 mins.

Remove foil and back uncovered for an additional 5 minutes or until golden brown.