Tuscan Garlic Butter Salmon Skillet with Spinach and Tomato

salmon fillets

tablespoons olive oil

unsalted butter

teaspoon red pepper flakes

teaspoon smoked paprika or more, to taste

Kosher salt and freshly ground black pepper,

teaspoon Italian seasoning

medium onion, chopped

cloves garlic, minced

Roma tomatoes, chopped

 oz fresh spinach

fresh basil leaves, chopped

(60ml) vegetable or chicken stock (or dry white wine)

 tablespoons high-quality olive oil, optional