In a shallow baking dish, add flour. Season with salt and pepper and add salmon, then toss until coated.
In a large skillet over medium heat, melt 1 tablespoon butter and olive oil. Add salmon and cook until golden, 5 minutes per side. Transfer to a plate.
Add remaining 2 tablespoons butter to skillet. Add garlic and cook until fragrant, 1 minute, then add lemon juice and white wine and bring to a simmer. Stir in capers, lemon slices and spinach and let cook down until wilted, 2 minutes.
Return salmon to skillet and combine.
Garnish with parsley and serve.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/garlic-lemon-salmon-piccata/