Quantity depends on how much you want to make. I used three Spaghetti Squash.
First, cut Squash in half, Then clean out seeds, and insides with a spoon. Rinse inside, and place in a pan inside up. Next, put olive oil on inside of Spaghetti Squash. Set oven 400 degrees Fahrenheit. When oven ready bake at 400 for 50 minutes. Take out oven. It will be hot, let stand a few minutes. Then you still might needs glove to strip out the Spaghetti squash sides. Some people use forks, but I find spoons work just fine. I place my Squash in a container till sauce is ready.
I used peeled, and deveined shrimp about 2 pounds. Rinse well. In a skillet pot add about two tablespoons of butter with two tablespoons of Menace the garlic. Cook a few minutes and stir. Next, add your lightly seasoned shrimp. Cook down a few minutes, and stir as needed till it looks the right color. Shrimp don't take long to cook. Now your going to use the same pot to make your fettuccine alfredo sauce. I kept my shrimp in the pot. Start adding your heavy cream. Add as much heavy cream you think you're going to need. Keep stirring. Start adding Parmesan cheese to thicken up your sauce. Once it's about the thickness you like. You can lightly season it. Remember the cheese is very salty. I added my steamed broccoli at this time. It depends how much you want. I put about 3 cups of broccoli. Stir well, add Parmesan cheese to thicken it up. Also, as it cools, it thickens. Just be careful not to over season. Now you have you shrimp with broccoli in your sauce. Take one of the Spaghetti squash shells that you cleaned out and put a layer of sauce at bottom. Next, put some of the Spaghetti squash. Then, top that off with more sauce. Mix well. Now, you can Sprinkle cheese on top, and serve.