Preheat oven to 350 degrees. Do not grease silicone Twinkie molds.
Bowl 1: egg whites+sugar. Whip till stiff peaks.
Bowl 2(main bowl): egg yolks+sugar. Whisk till pale and thick.
Bowl 3: flour+cornstarch+salt.
Slowly fold dry bowl into yolk bowl.
Gently fold white bowl into yolk bowl in at least thirds making sure not to deflate.
Split into 2 equal parts adding orange juice and zest to one half.
Combine cocoa powder and hot water. Then add to other half.
Alternate spooning batter into molds marbling with a toothpick. Fill mold ⅔ full.
Bake for 12 min then turn off oven and crack the door for another 3-5 minutes to continue baking but cooling cakes at a steady pace. Pulling immediately from the oven and cooling too rapidly will cause cakes the deflate and wrinkle. Cakes are done baking when toothpick comes out mostly clean.
Remove from oven to cool in molds for 5 min then transfer to wire rack.
GLAZE:
Cream butter.
Add powdered sugar till smooth.
Add vanilla.
Add orange juice and milk till desired taste and consistency is achieved.
