Cut the crust off all 4 sides of the bread, then cut the bread into 1 inch sticks.
Break the eggs into a large, shallow bowl and whisk until they are well blended.
Add the heavy cream and vanilla and whisk until you have a smooth custard.
Add the powdered sugar and cinnamon and whisk to combine.
Heat a large pan or griddle over medium heat and coat with butter.
Dip each stick into the custard making sure all edges and sides are coated, then place on the griddle. Repeat with remaining sticks, working in batches if necessary.
Cook for about 5 minutes, or until the sticks are golden brown, then flip and cook an additional 5 minutes to toast the other side.
Move the cooked French toast sticks to a plate, dust with powdered sugar or cinnamon sugar and serve.
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