In a greased 9x13 pan, mix together the chicken, cooked pasta, celery, milk, and cream of mushroom soup until everything's coated.
Cover and refrigerate overnight. This step actually matters — it lets the pasta absorb some liquid so it doesn't turn mushy.
The next day, preheat your oven to 350°F. Stir the frozen vegetables and cheese into the casserole. (No need to thaw the vegetables first — they'll cook perfectly in the oven)
Bake uncovered for 1 hour, until bubbly and the top is lightly golden.
To freeze: assemble through step 1, then transfer to freezer bags. Label with cooking instructions. Thaw overnight in fridge, then continue from step 3.
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