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1
Preheat oven to 400u00b0F.
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2
Line a large baking sheet with parchment paper. Set aside.
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3
Season steaks liberally on both sides with salt, black pepper, and garlic powder. Allow them to rest at room temperature while preparing pepper and onions.
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4
Slice bell peppers and onion into 1/4-inch strips and arrange on baking sheet.
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5
Drizzle bell pepper and onion slices with olive oil and season with salt and black pepper. Toss to coat.
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6
Transfer baking sheet to middle rack of oven. Roast peppers and onions for 25 minutes. At the 20-minute mark, begin searing the steaks.
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7
Set a large skillet over high heat and add oil and butter. Once oil is very hot and shimmering, add steaks. Sear steaks for 1 minute without moving them. Flip and sear other side for 45 seconds longer.
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8
Transfer seared steaks from skillet to center of baking sheet on middle rack of oven. Arrange peppers and onions over steaks.
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9
Roast steaks, peppers, and onions for 9-12 minutes, depending on desired level of doneness, until peppers and onions are browned. Allow meat to reach an internal temperature of at least 130u00b0F for a medium steak.
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10
Check to see that steaks are done. Remove from oven or add time as needed.
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11
Allow steaks and vegetables to rest 5 minutes before serving.
