Slice the Bundt cake into 8 equal pieces.
In a medium bowl, whisk together the eggs, milk, and vanilla.
Heat a non-stick skillet over medium heat and melt the butter in the skillet.
Dip a slice of cake in the egg mixture, making sure to coat all sides and allowing the excess to drip off. Place the cake in the skillet. Repeat with remaining slices.
Cook the cake for 2-3 minutes or until golden brown. Flip the slices over and cook for an additional 1-2 minutes or until golden.
Serve immediately with a sprinkle of powdered sugar, if desired.