Sunny's Meaty Cheesy Casserole Sliders

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1 package dinner rolls (12)

1 tablespoon steak seasoning 

1 pound thinly sliced deli roast beef 

8 ounces shredded processed Cheddar cheese 

4 ounces shredded provolone cheese 

1/4 cup chipotle mayonnaise 

2 scallions, white and green parts, chopped

1/2 cup (1 stick) unsalted butter, melted 

2 tablespoons onion pulp (grated on a rasp)

2 tablespoons grated Parmesan cheese 

1 tablespoon Worcestershire sauce 

1/2 teaspoon red chili flakes 

12 pickled sweet or hot pepper slices