Begin by heating 2 tablespoons of olive oil in a large skillet over medium-low heat. Season the salmon fillets generously with red pepper flakes, paprika, Italian seasoning, and salt. Carefully place the seasoned salmon in the hot skillet and cook for about 5 minutes on each side until it is cooked through and has a beautiful golden crust. Once done, remove the salmon from the skillet and set it aside on a plate.

In the same skillet, add 1 tablespoon of olive oil or butter over medium heat. Allow it to melt, then introduce the minced garlic and chopped onion. Sauté them gently, stirring occasionally for about 2-3 minutes until the onion becomes translucent and fragrant, but not browned.

Next, add the chopped tomatoes along with fresh basil and the spinach to the skillet. Stir the mixture and cook for 3-5 minutes, allowing the spinach to wilt and the tomatoes to soften.

Gently return the cooked salmon fillets to the skillet, nestling them in the sauce. Let them reheat briefly for about 1-2 minutes, ensuring they soak up all those delicious flavors.