Begin by slicing your day-old biscuits in half horizontally and set them aside.

In a medium bowl, whisk together eggs, whole milk, vanilla extract, and ground cinnamon until fully combined.

Place a non-stick skillet over medium heat and add a generous amount of butter.

Carefully dip each biscuit half into the egg mixture, soaking it for just a few seconds on each side.

Arrange the soaked biscuit halves in the hot skillet without overcrowding.

Once cooked, transfer the biscuits to plates while they are still warm.