Preheat oven to 425 degrees F.

Heat a large pot of water over high heat. Once boiling, cook the pasta according to package directions.

Meanwhile, add the Boursin cheese to the middle of a large pot or baking dish. Surround it with the salmon fillets. Add the cherry tomatoes and minced garlic to the pot and drizzle everything with olive oil. Sprinkle the onion powder, paprika, salt, and pepper over everything.

Bake for 20 minutes, or until the salmon is cooked through. 
Remove the pot from the oven and stir in the baby spinach and break up the salmon into pieces.

Stir in the cooked pasta and serve immediately.