Cinnamon Roll French Toast Casserole Recipe

Ingredients

• 1 stick butter, softened, or as needed
• 1 (16 ounce) loaf cinnamon swirl bread (such as Pepperidge Farm®)
• 1.5 cups milk
• 4 large eggs
• 0.25 cup white sugar
• 1 teaspoon vanilla extract
• 0.25 teaspoon salt