I created this recipe as part of a paid partnership with Fiber One™ Original Cereal but all content and ideas are my own.

This warm squash gratin is perfect for comfort food season. I partnered with Fiber One™ Original Cereal for National Fiber Month to create a few recipes. I decided to pump up one of my favorite squash gratin recipes with extra fiber.  By using Fiber One™ Original cereal in place of the breadcrumbs used in a traditional gratin dish, this dish offers nearly all of the Daily Value for fiber.

You can serve this as a side, or make it into a meatless meal by adding a tossed salad topped with beans.

Stay Balanced and Regular

You’ll find that as you get older, you need to get all of your nutrients from less calories. Fiber helps. Plus, fiber helps keep your gut healthy (and keeps you regular, reducing bloating). This Fiber One™ Fiber-Boosted Butternut Squash Grain provides 23 grams of fiber. It also provides 8 grams of protein, loads of beta-carotene and other vitamins and minerals.

  • This dish-for-one is perfect for anyone working from home and getting tired of sandwiches or salads for lunch. You can use a small (16-18-ounce) baking dish or a large ramekin to bake this in.
  • You’ll need a little over 30 minutes to put it together and bake it. I used frozen, cubed butternut squash to save time and effort.
  • You’ll want to enjoy this dish fresh out of the oven, but you can prep it ahead to Step 4, up to two days before (or freeze for up to 3 months), then pop it into the oven on your lunch break.

Remember – gradually add fiber to your diet. Be sure to drink plenty of fluids every day as you add more fiber to your diet.

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Fiber-Boosted Butternut Squash Gratin

Enjoy this simple casserole for a high fiber plant-based lunch or double it and serve as a side dish. You can make the whole dish in a small cast iron skillet, a large ramekin or a small casserole dish.
Author Rosanne Rust MS RDN, www.rustnutrition.com


  • Cooking spray
  • 2/3 cup Fiber OneTM Original cereal lightly crushed
  • 1/2 teaspoon minced fresh rosemary or ¼ teaspoon dried
  • 1 tablespoon grated Parmesan cheese
  • 1 teaspoon butter melted
  • 2 tablespoons low sodium vegetable stock divided
  • 2 tablespoons diced onion
  • 1/2 teaspoon olive oil
  • 1 ¼ cup cubed frozen butternut squash
  • 1 Pinch of salt
  • 2 teaspoons brown sugar
  • 1 tablespoon shredded Swiss cheese


  • Spray a small (18-ounce) casserole dish with cooking spray and set aside. Preheat oven to 375F. Defrost the squash in the microwave squash at 70% power for 1 to 2 minutes.
  • Place Fiber OneTM Original into a food processor and pulse until you have coarse crumbs. (If you don’t have a food processor, place the cereal into a freezer bag and roll with a rolling pin until crushed).
  • In a small bowl, combine the cereal, rosemary, Parmesan, melted butter and 1 teaspoon of the stock. Mix well.
  • Heat oil in a small nonstick skillet until hot. Add onion and sauté for 2 minutes.
  • Salt the squash and pour the remaining stock over it. Top it with the onion mixture and mix gently to combine. (you can freeze the dish at this point for up to 3 months, or store in refrigerator overnight). Top evenly with the Fiber OneTM mixture and bake for 15 minutes.
  • Remove gratin from oven and top evenly with the Swiss cheese. Return to oven for 10 to 12 more minutes, until lightly browned. Serve warm.


Prep: 10 minutes
Total: 35 minutes
Serving: 1 casserole
Yield: 1 serving