Greek Yogurt Mac 'n' Cheese - Stonyfield

Ingredients

• 1 medium Spanish onion (diced)
• 4 Tbsp butter
• 2 Tbsp olive oil
• 1/2 cup flour
• 2 cups Stonyfield Organic milk
• 1 tsp Tabasco or similar
• 1 tsp dry mustard powder
• 1 tsp Worcestershire Sauce
• 1/4 cup chicken or vegetable stock (optional)
• 3/4 lb sharp cheddar cheese (shredded)
• 1/4 lb Jack cheese of other favorite (shredded)
• 2 cups Stonyfield Organic Greek plain Whole Milk yogurt
• 16 oz pasta macaroni (cooked per instructions and set aside)
• 1/2 cup seasoned bread crumbs
• 1/2 cup grated Parmesan cheese
• Kosher salt and white pepper (to taste)