Preheat oven to 350 degrees F (175 degrees C). Line a 15x10x1-inch baking pan with parchment paper; set aside.
Trim a very thin slice from the round side of each Peach (6) half so halves stand flat on the baking pan. Dip peach halves in Butter (1/4 cup) to coat. Arrange peach halves, cut sides up, in prepared pan.
Sprinkle cut sides of peaches with the Cinnamon Sugar (3 tablespoon) mixture; set aside.
In a medium mixing bowl beat Cream Cheese (4 ounce) with a mixer on medium speed until smooth. Add Granulated Sugar (1/4 cup), yolk of the Egg (1), and Pure Vanilla Extract (1 1/2 teaspoon). Beat until combined.
Spoon cream cheese mixture into peach centers. Bake, uncovered, about 30 minutes or until lightly browned and softened.
Serve warm or at room temperature.