Whisk together cinnamon mixture, eggs, milk, and vanilla and pour into a shallow container such as a pie plate.
Dip bread in egg mixture.
In a 10-inch or 12-inch skillet, melt butter over medium heat.
Fry slices until golden brown, then flip to cook the other side.
Continue, adding more butter as needed, until all are cooked.
Serve immediately with butter and syrup.
Once cooked, French toast is best right away. However, if you do have leftovers, they will last in an airtight container in the fridge for up to 24 hours. To reheat, microwave, or warm on the stove to re-crisp.