adapted from Serious Eats
6 large eggs
4 tablespoons sugar
Pinch kosher salt
Pinch ground cinnamon
Pinch freshly grated nutmeg
1/4 teaspoon vanilla extract
2 cups milk
Set a wire rack on a rimmed baking sheet in the oven and preheat to 200°F.
Meanwhile, in a large mixing bowl, whisk together eggs, sugar, salt, cinnamon, nutmeg, and vanilla until thoroughly combined.
Add milk and whisk to blend.
Heat griddle to 350℉ and spray with cooking spray.
Soak bread in egg bath, turning, until saturated. Add soaked bread to griddle and cook until browned on bottom side, about 3 minutes.
Flip bread and continue to cook until browned on second side, about 3 minutes longer.
Transfer French toast to the rack in the oven in a single layer to keep warm and repeat with remaining slices of bread and egg bath.