Caramelized Onion and Breakfast Sausage Strata

Ingredients

• 1 tablespoon unsalted butter, at room temperature
• 1 tablespoon olive oil
• 12 ounces breakfast sausage, casing removed
• 1 large onion, thinly sliced
• 3 cups half-and-half
• 1/4 cup grated Parmesan
• 10 large eggs
• Kosher salt and freshly ground black pepper
• One 12-ounce loaf sourdough bread, crusts removed, cut into 1-inch cubes, preferably stale (about 6 cups)
• 2 cups shredded Muenster cheese

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