Let steaks stand at room temperature for 30 minutes. Pat steaks dry with paper towels, and sprinkle with salt and pepper.
Preheat oven to 425°.
In a 12-inch cast-iron skillet, melt butter over medium heat. Add onion and garlic; cook, stirring occasionally, for 5 minutes or until tender and browned. Remove onion and garlic from skillet, and set aside.
Add steaks to skillet, and cook, without moving, for 4 minutes. Turn steaks over, and return onion and garlic to pan.
Place skillet in oven, and bake for 5 minutes or until an instant-read meat thermometer registers 130°. Let stand for 10 minutes. Serve steaks with Caramelized Onion-Red Wine Sauce.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/vidalia-onion-roasted-steaks-recipe/