Sausage-and-Peppers Burgers

lean ground beef

hot or sweet Italian sausage, casings removed

garlic, grated

dried oregano

Kosher salt and freshly ground pepper

red onion, sliced 1/2 inch thick

bell peppers (1 red, 1 yellow), cut into 1/2-inch-wide strips

extra-virgin olive oil, plus more for brushing

slices provolone cheese

sesame potato hamburger buns, split

large basil leaves, torn

Warmed marinara sauce, for topping

Potato chips, for serving