Creamy Spinach and Red Pepper Chicken

Name: Creamy Spinach and Red Pepper Chicken
Ingredients: 4 tbsp. Butter; 4 tbsp. Olive Oil; 4 cloves Garlic, Sliced Thin Or Chopped; 1 whole Medium Yellow Onion, Diced; 10 oz. weight Baby Spinach; 1 c. Roasted Red Peppers, Sliced Into Strips; 4 whole Roma Tomatoes, Diced; 1/2 tsp. Kosher Salt, Plus More To Taste; 1/2 tsp. Black Pepper, Plus More To Taste; 1 1/4 c. Heavy Cream; 3/4 c. Grated Parmesan Cheese; 4 oz. weight Cream Cheese, Softened; 8 leaves Fresh Basil, Chiffonade; Parmsan Shavings, For Serving; 4 whole Boneless, Skinless Chicken Breasts