Preheat your oven to 400°F (200ºC).
Season your salmon fillets with kosher salt and black pepper on both sides. Place them on a baking dish and lightly spray with cooking spray before transferring them into the oven for about 12 minutes until cooked through.
While your salmon is baking, bring a large pot of salted water to boil and cook your pappardelle pasta according to package instructions until al dente.
In a medium pot over medium heat, melt the unsalted butter and add minced garlic cloves. Sauté for about two minutes or until fragrant but not browned.
Pour in heavy cream along with dry white grape juice and grated lemon zest into the pot with sautéed garlic. Let this mixture simmer for about one minute until it thickens slightly.
Once your pasta is cooked, add it along with baby spinach leaves and capers into the cream sauce, gently mixing everything together before flaking in your cooked salmon fillets on top. Serve immediately while hot!