Melt butter in a large skillet over medium-high heat. Add garlic and sauté for a minute.
6 tbsp. butter, 2 tsp. garlic
Add in heavy cream and bring mixture to a simmer.
1-1/2 cups heavy cream
Reduce heat to low and whisk in parmesan cheese. Stir until cheese is melted.
2 cups parmesan cheese
Add pesto and stir until combined. Season with salt & pepper if needed. Serve over pasta.
3 tbsp. prepared pesto, salt & pepper to taste