Step 1

Place Parmesan cheese in medium sized freezer bag.

Step 2

Place remaining ingredients in large freezer bag.

Step 3

Remove excess air and seal. Staple bags together above the seal. Freeze.

Step 4

Dump contents of large bag into casserole dish.

Step 5

In a separate bowl, mix 1/2 cup milk and 3 Tbsp. flour. Add to casserole dish and mix.

Step 6

Bake at 400° for 25 minutes. Top with Parmesan cheese and bake for another 10 minutes.