Preheat your oven to 375°F (190°C).
In a large skillet, heat 2 tablespoons of olive oil over medium-high heat. Add the sliced onions and sauté until they start to soften, about 3-4 minutes.
Add the sliced ribeye steak to the skillet and cook until browned, about 5-7 minutes. Season with salt and pepper.
Incorporate the bell peppers and cauliflower florets, stirring to combine with the meat and onions. Cook for another 4-5 minutes until the peppers soften.
Reduce the heat to low and pour in 1 cup of heavy cream, stirring to create a creamy consistency.
Transfer the mixture into a greased baking dish and top with 1 cup of shredded provolone cheese evenly over the top.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let it cool for a few minutes before serving.