Toaster-Oven Steak Fajitas

Adjust toaster oven rack to lowest position and heat oven to 450 degrees. Toss bell peppers, onion, and garlic with 1 tablespoon oil, ¼ teaspoon salt, and ¼ teaspoon pepper together on small rimmed baking sheet, then spread into even layer. Roast until vegetables are starting to soften, about 10 minutes.

Meanwhile, combine chili powder, sugar, remaining ¼ teaspoon salt, and remaining ¼ teaspoon pepper in bowl. Cut steak with grain into 2½- to 3-inch-wide strips. Pat steaks dry with paper towels, rub with remaining 1 teaspoon oil, and sprinkle with spice mixture.

Remove sheet from oven and push vegetables to one half of sheet. Place steaks on now-empty side of sheet, spaced evenly apart. Roast until vegetables are spotty brown and meat registers 130 to 135 degrees (for medium), 7 to 10 minutes.

Transfer steaks to cutting board, tent with aluminum foil, and let rest for 5 minutes. Toss vegetables with lime juice and any accumulated juices on sheet; transfer to serving platter. Slice steaks thin against grain and transfer to platter with vegetables. Serve steak and vegetables with tortillas and lime wedges.