Caramelized Onion, Spinach and Gruyere Cheese Strata with Sauteed Cherry Tomatoes recipe for managin

Ingredients

• 6 cups cubed day-old French bread, with crust
• 2 tablespoons unsalted butter, plus more for greasing
• 1 tablespoon canola oil
• 2 large Spanish onions, halved and thinly sliced
• 1 teaspoon sugar
• Kosher salt and freshly ground black pepper
• One 10-ounce box frozen chopped spinach, thawed and squeezed dry
• 10 large eggs
• 2 cups grated aged gruyere cheese
• 3 cups whole milk
• 1 cup heavy cream
• 2 teaspoons Dijon mustard
• 1 tablespoon finely chopped fresh thyme
• 1/8 teaspoon freshly grated nutmeg