Heat 2 tablespoons olive oil in a skillet over medium heat.
Pat the salmon very dry with paper towels. Sprinkle the flour onto a flat plate. Season the salmon with salt and pepper, then dredge in the flour. Place skin-side down into the pan and sear 4-5 minutes. Flip, and sear an additional 3-4 minutes until crispy and easily removed from the skillet. Move to a plate.
Melt the butter in the pan, then stir in the garlic cloves and lemon zest until fragrant, about 30-60 seconds. Pour in the wine and simmer until reduced, about 1-2 minutes. Add the sundried tomatoes, spinach, and heavy cream. Simmer a minute or two until the spinach wilts, stirring. Stir in the parmesan. Taste and adjust salt and pepper as desired.
Slide the salmon filets and any juices into the skillet. Base until warmed through for a couple minutes.
Divide onto plates and serve with rice, mashed potatoes, or polenta, as desired. Garnish with fresh basil.