Preheat oven to 350 degrees F.
Combine all of the filling ingredients in a food processor and process until smooth.
Spread a thin layer of pasta sauce in the bottom of a baking dish.
Fill each pasta shell with about 2 tablespoons of the filling and lay gently in the sauce lined baking dish.
Once you have filled all of your pasta shells and placed them in the baking dish, pour the remaining pasta sauce evenly over the top of the stuffed shells.
Cover with foil and bake 20 minutes. Uncover, then bake an additional 10 minutes or until bubbly.
Let sit 10 minutes, then serve with additional Parmesan substitute sprinkled on top, if desired.