Crack the eggs into a pie plate.
Add milk, sugar, and vanilla. Whisk until combined.
Heat a large nonstick skillet over medium heat. Then melt a small amount of butter.
Dip the Challah in the egg mixture so that it's fully coated. Cook the toast on the first side for 3 to 4 minutes. When it's deep golden brown, flip it to the other side and cook for about 2 minutes. Remove from the pan, and then cook the remaining bread slices.
Serve immediately with toppings of your choice.