Preheat the oven to 200 degrees Fahrenheit.
Toast the bread on a rimmed baking sheet in the oven for 15 minutes, flipping them over in the middle of toasting. Alternatively, you can leave them out overnight.
In a shallow dish whisk together the eggs, half and half, vanilla, cinnamon, and sugar. Ensure that the egg whites are fully broken down by dragging a fork through the batter. Nothing should hang on to the fork as it goes through.
6 large eggs, 1 cup half and half, 1/4 cup granulated sugar, 3 teaspoons vanilla extract, 1 teaspoon cinnamon
Dip the toasted bread slices one at a time, turning them several times to ensure they soak up a lot of the batter. I like to push them down in the batter once on each side to fully submerge them. The pieces of bread do not need to sit in the batter to soak.
10 pieces of thick bread
Heat a skillet over medium heat. Spray lightly with cooking spray. Cook the toast in batches for 2 to 3 minutes on each side. When you are done, tranfer them to a covered baking dish in the warm oven.
Serve with powdered sugar, whipped cream, and fruit.