Prepare your ingredients and bring a pot of salted water to boil for pasta.

Heat olive oil in a large skillet over medium heat. Season chicken breasts with salt and pepper; sear until golden brown on both sides (about 3 minutes each). Remove from skillet.

In the same skillet, melt butter and sauté garlic until fragrant (about 1 minute). Add sliced mushrooms; cook until tender.

Pour in chicken broth, lemon juice, and capers. Scrape up any browned bits and let simmer for 5 minutes.

Return chicken to the skillet, spoon sauce over it, and simmer until fully cooked (about 5 minutes).

While the chicken cooks, prepare pasta according to package instructions until al dente; drain while reserving some pasta water.

Serve pasta topped with chicken and sauce.