How to Make It
Heat 1 tablespoon of the oil in a large skillet over medium-high heat. Season the chicken with ½ teaspoon salt and ¼ teaspoon pepper.
Cook the chicken until browned and cooked through, 5 to 7 minutes per side. Transfer to a plate.
Return the skillet to medium-high heat and heat the remaining tablespoon of oil. Cook the mushrooms and pepper, tossing, for 3 minutes.
Add the garlic and wine and cook until the mushrooms are tender and the wine is nearly evaporated, 2 to 3 minutes.
Toss in the spinach and ½ teaspoon each salt and pepper. Serve with the chicken.