Clean and dry the plastic egg molds thoroughly.
Lightly spray the interior of each mold with vegetable oil spray to ensure easy release.
Close the egg molds securely and place them upright in an egg carton or a stable container.
For each flavor, dissolve 3 ounces of gelatin powder in 3/4 cup of boiling water, stirring for 2 minutes until fully dissolved.
Stir in 1/4 cup of cold water into the gelatin mixture.
Using a clean syringe or a small funnel, pour the liquid gelatin into the hole at the top of each egg mold until filled to the top.
Refrigerate the molds for at least 4 hours or until the gelatin is completely firm.
To unmold, carefully open the plastic shells and gently slide a dull knife around the edge to release the gelatin egg.