Heat 2 tablespoons of vegetable oil in a skillet over medium-high heat.
Add the sliced onions and bell peppers, sauté until softened, about 5 minutes. Set aside.
Season the ribeye steak slices with salt and pepper, then add to the skillet. Cook until browned and cooked through, about 4 minutes.
Remove from heat, return sautéed onion and bell pepper to the pan and let the steak and vegetable mixture cool slightly.
Lay out the egg roll wrappers. Place half a slice of provolone cheese on each wrapper.
Spoon about 2-3 tablespoons of the steak mixture onto the center of each wrapper.
Fold the bottom corner over the filling, then fold in the sides and roll tightly. Use a little water to seal the edges of the wrappers.
Heat oil in a deep fryer or large pot to 350°F.
Fry the egg rolls in batches until golden brown and crispy, about 3-5 minutes.
Drain on paper towels and serve hot.