Preheat the oven to 400°F (200°C). Spread the frozen waffle fries on a baking sheet and bake according to package instructions (typically 20-25 minutes) until crispy and golden.

While fries are baking, heat olive oil in a large skillet over medium-high heat. Add sliced onions and bell peppers, and sauté until they are softened and caramelized, about 5-7 minutes.

Season thinly sliced steak with garlic salt and black pepper. Add steak to the skillet with onions and peppers. Cook until steak is browned and cooked through, about 4-5 minutes.

Once fries are cooked, remove from the oven and place on a serving dish. Top with steak, onion, and pepper mixture.

Layer White American cheese slices over the steak and veggie mixture. Return dish to the oven for another 3-4 minutes, until cheese is melted and bubbly.

Serve immediately and enjoy!