- Preheat the oven to 400°F (200°C).
- Roll out the gluten-free pizza dough on a floured surface.
- In a skillet, heat olive oil and sauté the onions and bell peppers until soft.
- Spread the cooked steak, sautéed vegetables, and mozzarella cheese evenly over the dough.
- Sprinkle garlic powder, Italian seasoning, salt, and pepper on top.
- Roll the dough tightly into a log and seal the edges.
- Place the stromboli on a baking sheet lined with parchment paper.
- Bake for 25-30 minutes or until golden brown.
- Let it cool for a few minutes before slicing and serving.
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