When making Apple Pie in a Glass, it's essential to choose the right variety of apples. Opt for firm apples like Granny Smith or Honeycrisp, as they hold their shape well during cooking. To achieve the ideal balance of sweetness, toss the sliced apples with a blend of brown sugar, cinnamon, and a pinch of nutmeg. This creates a luscious filling that will have you swooning with every spoonful.