This question has options. How would someone go about accomplishing this goal?
To make a creamy pesto sauce.

OPT: [-] Using a food processor, combine 2 cups fresh basil leaves, 1/2 cup extra virgin olive oil, 1/3 cup pine nuts, 2 small cloves of garlic, 1/2 cup freshly grated Parmigiano-Reggiano cheese, 1 tsp coarse kosher salt, 1/4 cup heavy cream, and 2 tbsp butter. [-] Using a food processor, combine 2 cups fresh basil leaves, 1/2 cup extra virgin olive oil, 1/3 cup pine nuts, 2 small cloves of garlic, 1/2 cup freshly grated Cheddar cheese, 1 tsp coarse kosher salt, 1/4 cup heavy cream, and 2 tbsp butter.
Using a food processor, combine 2 cups fresh basil leaves, 1/2 cup extra virgin olive oil, 1/3 cup pine nuts, 2 small cloves of garlic, 1/2 cup freshly grated Parmigiano-Reggiano cheese, 1 tsp coarse kosher salt, 1/4 cup heavy cream, and 2 tbsp butter.