Season turkey steaks with salt and pepper. Heat oil in a pan over medium-high heat and fry steaks 2-3 minutes per side until golden. Transfer steaks to a baking dish.
Chop red onion and garlic, add to the pan, and fry for 2 minutes over medium-high heat. Drain mushrooms, cut in half, add to pan, pour in cream, and season with salt, pepper, and chili powder. Fry for 2 more minutes.
Pour the sauce over turkey steaks. Transfer baking dish to oven and bake for 10 minutes until turkey reaches 74°C (165°F) at the thickest part.