1Preheat the oven to 375 degrees. Spray 8 cups of a muffin tin with cooking spray and set aside. Thaw the biscuits in the microwave on 50% power. Or, if you're planning ahead to make these, simply thaw them in the refrigerator tightly covered overnight. On a small plate, mix together the cinnamon and sugar until combined. Dip each thawed biscuit into the melted butter then sprinkle all sides with the cinnamon sugar mixture.
Place each biscuit into a muffin cup, and press gently into the cup. Make a deep well in the center of each using your thumb. Into the well, drop 1 teaspoon of apple jelly. Bake at 375 degrees for 14-16 minutes or until golden. While the biscuits are baking, mix together the glaze. Stir together 1/2 cup of powdered sugar, 1 1/2 teaspoons of half & half and 1 teaspoon of vanilla until all of the sugar has dissolved. Remove the hot biscuit muffins to a serving platter and sprinkle with additional cinnamon sugar, if desired. Drizzle with glaze and serve hot.