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a plate of roasted butternut squash sandwiches with pesto
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5 from 3 votes

Roasted Butternut Squash Sandwich with Caramelized Onions and Pesto

This roasted butternut squash sandwich with caramelized onion and pesto is a super easy recipe to make when winter squash is abundant. It is excellent for a meatless lunch or dinner.
Prep Time10 minutes
Cook Time50 minutes
Total Time1 hour
Course: Appetizer, Main Dish
Cuisine: American
Keyword: butternut squash sandwich
Servings: 2 people
Calories: 332kcal
Author: Sophie

Ingredients

  • 18 oz peeled and thinly sliced butternut squash (no more than ¼ inch thick)
  • 1/2 plus 1/8 teaspoon salt, divided
  • 3/8 teaspoon black pepper, divided
  • olive oil
  • 2 yellow onions, peeled and thinly sliced (about 10.5 oz/300g)
  • 1 tablespoon butter
  • your choice of bread for sandwich
  • 2-4 tablespoons pesto
US Customary - Grams

Instructions

  • Preheat the oven to 425°F (220°C). Toss the butternut squash slices with ⅜ teaspoon salt, ¼ teaspoon pepper and 2½ tablespoons olive oil. Arrange them in a single layer on a baking sheet lined with parchment paper.
  • Roast the butternut squash in the preheated oven for about 20 minutes, then flip and roast until tender and browned to your liking, about 10 minutes more.
  • Place a skillet over medium heat and add oil to coat the bottom. Once the oil is hot, add the onion slices. Let them cook, stirring occasionally for about 15 minutes. Reduce the heat if needed.
  • Add the remaining salt and pepper to the onions, stir and cook for another 5 minutes. Increase the heat back to medium, then add butter. Continue to stir and cook for 20-30 minutes more until they are browned, soft and sweet. A light degree of caramelization will also work.
  • Toast the bread. Spread pesto on each cut side, then add the roasted butternut squash slices and caramelized onions. See Notes for optional add-ins. Serve right away.

Notes

You can customize this roasted butternut squash sandwich by adding more filling, such as:
  • cheese
  • arugula
  • other roasted veggies such as zucchini or eggplant
You can use ciabatta, hoagie rolls, baguettes or your other favorite bread for sandwich.

Nutrition

Calories: 332kcal | Carbohydrates: 55g | Protein: 7g | Fat: 12g | Saturated Fat: 5g | Polyunsaturated Fat: 0.3g | Monounsaturated Fat: 2g | Trans Fat: 0.2g | Cholesterol: 16mg | Sodium: 1064mg | Potassium: 1066mg | Fiber: 8g | Sugar: 11g | Vitamin A: 27604IU | Vitamin C: 62mg | Calcium: 176mg | Iron: 2mg