Fennel-Crusted Sirloin Tips with Bell Peppers

Rub steak with fennel seed and 1/4 teaspoon salt, turning to coat on all sides. Heat oil in a large skillet over medium-high heat. Add the steak in a single layer and cook, turning once, until browned on the outside and still pink in the middle, 2 to 4 minutes. Transfer to a plate and cover with foil to keep warm.

Add garlic to the pan and cook, stirring constantly, until fragrant, about 30 seconds. Add 1/2 cup broth and wine, scraping up any browned bits with a wooden spoon. Add bell peppers, the remaining 1/4 teaspoon salt and pepper; bring to a simmer. Cover, reduce heat to maintain a simmer and cook until the peppers are tender-crisp, 4 to 6 minutes.

Whisk the remaining 1/4 cup broth and flour in a small bowl. Add to the pepper mixture, increase heat to medium-high and bring to a simmer, stirring constantly. Return the steak to the pan. Adjust heat to maintain a slow simmer and cook, turning the meat once, about 2 minutes for medium-rare.