My butternut-loving heart be still! Sweet roasted butternut squash mashed with caramelized onions shmeared on crostini will make you never look back on “regular” bruschetta. The tangy drizzle of balsamic and fresh mint is a perfect refresher to the otherwise sweet and spicy appetizer!
Preheat the oven to 400°F.
Spread butternut squash on a large rimmed baking sheet and drizzle with 2 tablespoons olive oil. Season generously with salt and pepper. Let cook for 25 to 30 minutes until fork tender. While roasting, turn with a spatula every 10 minutes and add more olive oil if needed. Remove from oven and increase heat to 425°F.
Meanwhile, in a large skillet, heat remaining 2 tablespoons olive oil over medium heat. Add onions, and season with salt. Let cook until very soft and caramelized, about 20 to 25 minutes. Add maple syrup and crushed red pepper, and let cook 1 more minute.
Combine squash and onion mixture together in a food processor and pulse about 5 to 7 times until just barely incorporated and still fairly chunky. Adjust seasoning to taste.
Place bread slices on a large baking tray and drizzle lightly with olive oil. Bake 5 to 8 minutes, or until lightly browned on top. Generously top bread with butternut squash mixture and generously drizzle with balsamic vinegar. Top with fresh mint and serve immediately while warm.