Heat oil and butter in a skillet.
Add garlic and shallots to pan and cook 5 minutes.
Sprinkle in the flour and cook 2 minutes.
Increase heat and deglaze pan with the broth.
Add cream and cheese, stirring to melt cheese.
Lower to a simmer.
Meanwhile, cook shells, drain and pour into the sauce.
Top with parsley and season with salt/pepper.