Step 1Preparation Whisk eggs, milk, granulated sugar, vanilla, cinnamon, and salt in a large bowl.Step 2Heat a large griddle or 2 cast-iron or nonstick skillets over medium. Brush with a thin coating of oil, then a thin coating of butter.Step 3Working in batches, dip each slice of bread into egg mixture. Cook, flipping halfway through, until golden brown on each side, about 2 minutes per side. Repeat with remaining bread, brushing griddle with remaining oil and butter as needed. Dust French toast with powdered sugar just before serving. Serve with maple syrup alongside.Step 4Cooks' NoteIf you don't have a griddle or 2 skillets, use 1 skillet to cook the French toast.