Leftover Grilled Salmon Chowder

Ingredients

• 5 small red potatoes, cut into bite-size pieces
• 2 tablespoons olive oil
• 1 onion, diced
• 2 stalks celery, thinly sliced
• 2 tablespoons all-purpose flour, or as needed
• 1/2 teaspoon salt
• 1/4 teaspoon ground black pepper
• 4 cups 2% milk
• 1 cooked salmon fillet, flaked
• 1 1/4 cups frozen peas
• 1 1/4 cups frozen corn
• 1 teaspoon dried dill weed
• 1/2 cup shredded reduced-fat Swiss cheese
• 1/2 cup shredded reduced-fat Cheddar cheese
• 1 green onion, finely chopped