Creamy Tuscan Chicken with Mushrooms, Spinach, & Cherry Tomatoes

Name: Creamy Tuscan Chicken with Mushrooms, Spinach, & Cherry Tomatoes
Cook time: 35 min
Total time: 35 min
Cuisine: Italian
Ingredients: 1 (5 oz) pkg baby spinach; 2 lb chicken thighs, boneless skinless; 1 lb cremini mushrooms; 2 cloves garlic; 1 pint grape tomatoes; 8 fl oz heavy whipping cream; 2 oz Parmesan cheese; 1 medium yellow onion; black pepper; butter, unsalted; crushed red pepper; Italian seasoning; salt