Ingredients

• 1 tablespoon olive oil
• 1 large onion, thinly sliced
• kosher salt and black pepper
• 1 bell pepper, thinly sliced
• 1 bunch spinach, thick stems removed (about 4 cups)
• 1 pound  buffalo sliders (8 patties)
• 8 small rolls, split

 Directions

1. Heat broiler. Heat the oil in a large skillet over medium heat. Add the onion, 1/2 teaspoon salt, and 1/4 teaspoon pepper and cook, stirring occasionally, until the onion begins to soften, 5 to 6 minutes. Add the bell pepper and cook, stirring occasionally, until softened, 5 to 6 minutes. Add the spinach and cook, tossing, until the spinach is just wilted, 1 to 2 minutes.
2. Meanwhile, place the buffalo patties on a broiler proof rimmed baking sheet and broil until cooked through, 4 to 5 minutes per side.
3. Form sandwiches with the rolls, buffalo sliders, and vegetable mixture.