Tuna Enchiladas with White Beans, quick and easy from Thyme for Cooking.

Ingredients

• 1 onion
• 1/2 green bell pepper
• 4oz (120gr) pimiento or roasted red peppers
• 4oz (120gr) green chilies
• 1 rib celery
• 3 cloves garlic
• 1 tbs olive oil
• 9oz (270gr) tuna
• 1 3/4 cups (15oz, 450gr) white beans (cannellini)
• 1 cup (4oz, 120gr) shredded Gruyère cheese - divided
• 1/2 cup green olives - pimento stuffed
• 2 cups (16oz, 480ml) chicken stock
• 3 tbs cornstarch (maizena) dissolved in 3 tbs chicken stock
• 1/2 cup (4oz, 120ml) Greek or plain yogurt or sour cream