In a large saute pan, heat oil over moderate heat.  Add mushrooms and cook for a few minutes until they begin to brown.  

Add salt and pepper.  Add spinach and cook for 2 minutes.  Remove from heat and mix in mascarpone.  

Place in a food processor and pulse a few times.

Roll pasta dough out thin and cut the large strip in half. Place on cookie sheet lined with parchment paper.  

Put teaspoons of filling spaced out on the dough and cover with the other half of pasta dough.  Cut out squares with a pastry cutter.

To cook ravioli, boil a large pot of salted water and cook for 2-3 minutes until the ravioli floats.