In a bowl, toss the thinly sliced ribeye with olive oil, salt, pepper, and smoked paprika. Set aside while you prep the onions.
Sauté the Onions & Peppers
Heat butter in a skillet over medium heat. Add the onions and peppers, seasoning with salt. Cook for about 5-7 minutes until soft and caramelized. Remove from the pan and set aside.
Cook the Steak
In the same skillet, add the steak and cook over high heat for about 3-4 minutes until browned. Stir occasionally to ensure even cooking.
Add BBQ Sauce & Cheese
Lower the heat and pour in the BBQ sauce, stirring until the steak is coated. Layer the cheese on top and let it melt into the steak mixture.
Toast the Bread
While the cheese melts, butter your hoagie rolls or sourdough slices and toast them on a separate pan or the griddle until golden brown.
Assemble & Serve
Load the BBQ steak and cheese mixture onto the toasted bread, top with the caramelized onions and peppers, and dig in!