Step 4. Add heavy cream and broth to the pan and cook for 3 minutes. In a small bowl, mix together arrowroot and water. Pour into the pan and cook until thickened, 2-3 minutes more. Step 5. In a large bowl, mix together noodles, sauce, peas, tuna and 1 ½ cup cheese.
This Keto Tuna Casserole recipe actually comes together very quickly. You can make it in about 50 minutes, so it's a great throw-together weeknight dinner.