Philly Cheesesteak Strata

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One 20-ounce bag hoagie rolls

One 9-ounce package frozen steak slices, such as Steak-umms, thawed

2 tablespoons olive oil

1 large yellow onion, chopped

2 medium green bell peppers, cored, seeded and chopped

One 8-ounce container fresh sliced mushrooms

Kosher salt and freshly ground black pepper

One 15-ounce jar processed cheese sauce

6 large eggs

1 1/2 cups half-and-half

12 slices provolone