Cook pasta to al dente. Strain completely. In frying pan after adding butter, combine shrimp, mushrooms, broccoli and seasonings. Mix well and let broccoli and shrimp thaw if they aren't already. Add pasta to big mixing bowl with sauce. Stir. Add the ingredients from the frying pan, and one tbsp grated parmesan. Stir until mixed all the way. On a 9x12 baking pan greased, spread half of the mixture on the pan. Put approximately 1 1/2 cups mozzarella cheese on top. Then laying remaining half of penne mixture on top of the cheese. Put in oven for 20 minutes on 375. After 20 minutes, put the remaining mozzarella and parmesan cheese on top. Put back in oven for approx 5-7 min letting last layer of cheese melt.