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Heat oven to 375°F. Spray 13x9-inch pan with cooking spray. Scatter peach slices evenly in pan. Sprinkle granulated sugar, cornstarch, 1/2 teaspoon cinnamon and the lemon juice evenly over top; stir to combine. Top evenly with 3 tablespoons cubed butter.
In 1-quart saucepan, heat 1/2 cup butter over medium heat 8 to 10 minutes, stirring frequently, until light golden brown. Pour into large bowl. Stir cookie mix, 1/2 teaspoon cinnamon and the egg into browned butter with wooden spoon until soft dough forms. Spoon dough in tablespoons evenly over top of peach mixture; sprinkle with sparkling sugar.
Bake 30 to 35 minutes or until cookies are golden brown and edges of fruit filling are bubbly. Cool 10 minutes before serving.