- PREHEAT oven to 400F. Arrange baguette slices in a single layer on a large baking sheet. Toast in centre of oven until golden, about 8 min.
- CUT an acorn squash into quarters, lengthwise. Save 2 pieces for another use.
- CUT remaining 2 pieces crosswise into 24 slices. Toss with 1 tbsp melted butter and 1/4 tsp salt on a baking sheet. Season with fresh pepper. Roast at 400F until tender, 17 to 20 min. Melt 2 tbsp butter in a medium saucepan over medium-high. Add 24 fresh sage leaves and cook until crisp, 2 to 3 min. Spread 150 g Boursin on crostini toasts. Top with roasted squash and sage.