Grilled Potatoes and Onions | Faxo

Ingredients

• 1 c. mayonnaise
• 1/4 c. shredded Parmesan cheese
• 3 cloves garlic, minced
• 1/2 t. paprika
• 1/4 t. crushed red pepper flakes
• 1/4 t. salt
• 1/4 t. ground black pepper
• 3 large baking potatoes, cut into 1/4" slices
• 1 large sweet onion, sliced
• 4 (12x12") squares aluminum foil
• cooking spray