Preheat your oven to 350°F. Place the premade thin pizza crust on a round baking sheet.
Add the butter, sugar, and lemon juice to a small pot on medium heat. Stir well as the butter and sugar melt together, about 1 to 2 minutes. Add the apple slices and coat well in the mixture.
Put the apples on the pizza crust in an even layer, being sure to scrape out all of the butter-sugar mixture onto the apples. Sprinkle with cinnamon.
While the pizza cools for about 5 minutes, whisk together the powdered sugar and 1-2 tablespoons of milk to create a smooth glaze. Drizzle the glaze over the warm pizza, slice, and serve.