Begin by cooking the crinkle cut French fries according to package instructions, aiming for a golden, crispy texture. Bake or fry at 425°F for 20-25 minutes.

In a large skillet, heat cooking oil over medium heat. Add chopped onions and diced green peppers, sauté for about 8 minutes until softened and slightly caramelized.

In the same skillet, add sliced mushrooms and thinly sliced steak. Stir-fry for about 10 minutes until cooked through and slightly browned.

While the steak is cooking, warm the Cheez Whiz in a small saucepan over low heat, stirring occasionally until smooth and creamy, about 3-5 minutes.

In a large mixing bowl, combine the crispy fries, sautéed vegetables, and cooked steak mixture, then drizzle the melted Cheez Whiz generously over the top.

Transfer the assembled Philly Cheesesteak Fries to a serving platter and serve immediately.