Lightly grease a brain-shaped gelatin mold with cooking spray.

Stir peach gelatin mix with 3 cups boiling water in a bowl until the gelatin is dissolved. Allow it to cool to room temperature, about 20 minutes.

Mix in evaporated milk and peach schnapps into the cooled gelatin; pour the mixture into the prepared mold.

Refrigerate until fully set, approximately 4 to 6 hours.

Dip the mold in warm water to loosen, ensuring water does not enter the mold. Invert the mold onto a serving platter and lift gently to release the brain.

Mix 4 drops of blue food coloring and 2 drops of red food coloring with 2 teaspoons of water in a small bowl. Use a clean paintbrush to add the coloring into the grooves of the brain surface.