3 small Granny Smith apples, (peeled, cored, and diced small (about 2 cups))
½ cup (100 g) light brown sugar, (packed)
1 tablespoon ground cinnamon
⅔ cup (133 g) granulated sugar
½ cup (1 stick / 113 g) unsalted butter (room temperature)
2 large eggs, (room temperature)
2 teaspoons vanilla extract
½ cup (122.5 g) whole milk, (room temperature)
1 ½ cups (187.5 g) all-purpose flour
2 teaspoons baking powder
½ teaspoon kosher salt
1 cup (125 g) confectioners' sugar
2-3 tablespoons whole milk