Instant Pot Tuna Noodle Casserole is a classic old fashioned recipe that you can cook in just a few minutes using your pressure cooker. Tender noodles, peas, celery, garlic, cheese, and more.
Add the chopped onion and diced celery to the hot oil and cook until onion is translucent, about 3 minutes. Add the garlic and continue cooking for 1 minute until fragrant.
Remove vegetables and put them in a small dish. Place 2 Tablespoons of oil in the same pan and melt. Stir in the all-purpose flour until you form a brown roux.