Butternut Squash and Kale Strata with Multigrain Bread

Ingredients

• 2 1/2 tbsp. unsalted butter -
• Butter -
• 2 lb. butternut squash -
• 1/4 c. extra-virgin olive oil -
• 1 tbsp. extra-virgin olive oil -
• Kosher salt -
• Freshly ground black pepper -
• 2 1/2 medium onions -
• 1/2 small onion -
• 3/4 lb. kale -
• 2 cloves garlic -
• 1 pinch crushed red pepper -
• 2 tsp. finely chopped thyme -
• 1/4 c. all-purpose flour -
• 2 1/2 c. milk -
• 1 c. heavy cream -
• 1/2 c. Crème fraîche -
• 1 tsp. sugar -
• 8 large eggs -
• 1 lb. multigrain baguette -
• c. Parmigiano-Reggiano cheese -