Three Cheese Pasta

Ingredients

• 8 to 10 dry pasta (macaroni or spirelli)
• 2 Tbsp. butter or margarine
• 1/2 c. finely chopped onion
• 1/2 c. sour cream of plain yogurt
• 1/2 c. milk
• 1/2 c. Cheddar cheese
• 1/2 c. Mozzarella cheese
• 1/2 c. grated Romano or Parmesan cheese
• 1 can cream of potato soup (or chicken)
• 1 lb. spinach fettucine, cooked al dente
• 1/2 c. milk
• 5 Tbsp. unsalted butter
• 1/4 lb. Gorgonzola Blue cheese, crumbled (available in Italian markets and most gourmet grocery stores)
• 1/4 c. whipping cream
• 1/4 c. grated Parmesan or Romano cheese