Chicken Cheesesteaks
Stir together the chipotle powder, salt, pepper, garlic powder, and onion powder. Toss with the sliced chicken until evenly coated.
Heat the olive oil in a large skillet over medium heat. Add the onion and bell peppers and cook, stirring occasionally, until soft and golden, 8 to 10 minutes. Push to one side of the pan.
Raise the heat to medium-high. Add the chicken in a single layer and let it sit undisturbed for 2 minutes, then stir and cook until just cooked through, 3 to 4 minutes more.
Chop the chicken roughly in the pan with a spatula and stir the onions and peppers back in. Turn off the heat and cover to keep warm.
Cut each roll in half crosswise, then split each piece. Spread the cut sides with butter and toast under the broiler or in a dry skillet until golden.
Garlicky Provolone Dipping Sauce
Warm the milk in a small saucepan over medium-low until steaming. Add the cream cheese and whisk until completely smooth.
Remove the pan from the heat. Add the provolone a handful at a time, whisking until each addition melts before adding more. Whisk in the Italian blend the same way, then stir in the garlic powder.
Pile the chicken mixture onto the toasted rolls and close. Pour the sauce into a bowl, set it in the center of a platter, arrange the sandwiches around it, and serve warm.