Step 1

Season chicken with salt and pepper. Dredge in flour, tapping off excess. Heat a large skillet over high; swirl in 3 tablespoons oil. Add chicken; cook until golden brown and cooked through, 3 to 4 minutes a side. Transfer to a plate.

Step 2

Add flour to skillet; cook 30 seconds. Add capers, then whisk in 3/4 cup broth until it comes to a boil. Whisk in lemon juice and butter. Return chicken to skillet; coat in sauce and simmer until thickened, about 30 seconds.

Step 3

Heat remaining 1 tablespoon oil in a large saucepan over medium. Add garlic and broccoli rabe; toss to coat. Add remaining 1/2 cup broth, cover, and simmer, still over medium heat, stirring occasionally, until broccoli rabe is tender, about 10 minutes. Serve chicken and sauce over broccoli rabe, with bread.