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Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes
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Japan Authentic home cooking from Japan, with US measurements.
Originally published on Cookpad Japan as 簡単作り置き♪冷凍OK!お弁当用グラタン
A picture of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.

Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes

たかたかっち♪
たかたかっち♪ @cook_40107881

Make-ahead gratin for bento box lunches that you can freeze. Preparing a batch in advance makes packing lunches so much easier!

This recipe was featured in a cookbook.

Recipe background: Store-bought frozen gratin for bento boxes is expensive and often comes with shrimp, which my kids don’t like and always leave behind, so I made my own version.

Make-ahead gratin for bento box lunches that you can freeze. Preparing a batch in advance makes packing lunches so much easier!

This recipe was featured in a cookbook.

Recipe background: Store-bought frozen gratin for bento boxes is expensive and often comes with shrimp, which my kids don’t like and always leave behind, so I made my own version.

Read more

Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes

たかたかっち♪
たかたかっち♪ @cook_40107881

Make-ahead gratin for bento box lunches that you can freeze. Preparing a batch in advance makes packing lunches so much easier!

This recipe was featured in a cookbook.

Recipe background: Store-bought frozen gratin for bento boxes is expensive and often comes with shrimp, which my kids don’t like and always leave behind, so I made my own version.

Make-ahead gratin for bento box lunches that you can freeze. Preparing a batch in advance makes packing lunches so much easier!

This recipe was featured in a cookbook.

Recipe background: Store-bought frozen gratin for bento boxes is expensive and often comes with shrimp, which my kids don’t like and always leave behind, so I made my own version.

Read more
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Ingredients

Makes 6 (size #8) aluminum baking cups
  1. 1/2small onion (or 1/4 medium onion)
  2. 2 slicesbacon (long slices; use 4 slices if using half-length)
  3. Any amount frozen corn (any type of corn is fine)
  4. as neededMacaroni,
  5. 1/2 cupmilk (100 ml)
  6. About 2 tablespoons all-purpose flour
  7. as neededShredded cheese (pizza cheese),
  8. as neededGrated Parmesan cheese,
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Steps

  1. 1

    Finely chop the onion. Cut the bacon into thin strips. Cook the macaroni according to the package instructions, then drain. (The photo shows approximate amounts.)

    A picture of step 1 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  2. 2

    Heat some butter (not listed in ingredients) in a frying pan. Sauté the onion, bacon, and corn.

  3. 3

    When the onion is cooked and translucent, add the macaroni and mix well. Turn off the heat.

  4. 4

    Add the flour to the pan and mix until everything is coated. (Adjust the amount of flour so it coats all the ingredients evenly.)

    A picture of step 4 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  5. 5

    Add the milk and mix again.

    A picture of step 5 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  6. 6

    Turn the heat back on to low or medium-low. Stir constantly with a spatula until the mixture thickens. It will thicken quickly.

    A picture of step 6 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  7. 7

    Once thickened, turn off the heat. Spoon the mixture into aluminum baking cups.

  8. 8

    Top with shredded cheese and sprinkle with grated Parmesan cheese.

    A picture of step 8 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  9. 9

    Bake in a toaster oven until golden brown. (My toaster is 860W and takes about 5–6 minutes. Adjust baking time as needed.)

    A picture of step 9 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  10. 10

    Once cooled, transfer to a storage container or freezer-safe container and freeze. (In the photo, each is wrapped in plastic wrap before being placed in the container.)

    A picture of step 10 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  11. 11

    To thaw, move to the refrigerator the night before or let thaw at room temperature. If still partially frozen, warm briefly in the toaster oven.

  12. 12

    Adjust the amount of milk and flour in step 6 to get your preferred thickness.

  13. 13

    Published August 24, 2019 by Takarajimasha in “Delicious Cheese Recipes” (p.49).

    A picture of step 13 of Easy Make-Ahead Freezer-Friendly! Gratin for Bento Boxes.
  14. 14

    Ranked #1 in popular searches for “make-ahead freezer meals.” Thank you!

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たかたかっち♪
たかたかっち♪ @cook_40107881
Published in the US on April 20, 2026 16:02
肉好き息子2人の母です。家にある材料で簡単・手軽に出来るメニューを日々研究中です(^^)息子2人…ご飯は白飯派!味付きご飯は苦手(肉丼除く)皆さんのメニューを参考に簡単ランチも楽しんでます
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