Ravioli with four- cheese sauce

Ingredients
12-16 oz of fresh ravioli ( I get mine from Costco)
3 T butter
3 T all-purpose flour
2 cups milk
2 oz parmesan cheese
2 oz Edam cheese
2 oz Gruyere cheese
2 oz Fontina cheese
salt and ground black pepper
chopped fresh parsley, to garnish

Directions
1. Cook the pasta following the instruction on the package.
2. Meanwhile, melt the butter in a saucepan, stir in the flour and cook for 2 minutes, stirring.
3. Gradually stir in the milk until well blended.
4. Bring the milk to a boil over low heat, stirring constantly until thickened.
5. Grate the cheeses and stir them into the sauce. Stir until they are just beginning to melt. Remove the sauce from the heat and season with salt and pepper.
6. Drain the pasta thoroughly and turn it into a large serving bowl. Pour on the sauce and toss to coat. Serve immediately, garnished with the chopped parsley.