Philly Cheese Steak Bubble Up Casserole

canola oil

green bell peppers ((sliced))

yellow onion ((sliced))

baby bella or white mushrooms ((sliced))

cooked sirloin steak * ((shredded, shaved or chopped))

unsalted butter ((you can use salted, just adjust added salt to your preference))

flour

garlic ((minced))

dried oregano

salt

fresh ground black pepper

beef broth

skim milk

can of biscuits ((cut into quarters)**)

part-skim mozzarella cheese ((shredded))