Store: Refrigerate leftovers in an airtight container for up to 1 day. To “rehydrate” the noodles, add a splash of milk while simmering on the stove. Add as much milk as you need until desired consistency. It will taste like fresh.
Freeze: Do not!
Cooked chicken leftovers: You can use cooked chicken and skip step 4 to save time. Rotisserie, baked chicken or Instant Pot chicken breast would work great.
Vegetable substitution: If you are not a fan of peas, you can also use frozen or cooked broccoli or fresh chopped spinach. Frozen broccoli are pre-cooked and do not need to be thawed. Just give them a few minutes to thaw in the sauce and sauce to heat up after. Chopped spinach wilts right away from heat pretty much.
Thickener: You can substitute cornstarch with arrowroot powder 1:1. If you would like to use flour, you would need to double the cornstarch amount which would be 4 tbsp.