Preheat oven to 450°F.

Melt 2 tablespoons of butter in the microwave or in a saucepan.

In a medium-sized bowl, crack the eggs.

Beat the eggs lightly and then add the melted butter.

Measure milk, 1 tablespoon sugar, vanilla, 1/4 teaspoon ground cinnamon, salt, and flour, and add them to the eggs.

Mix all of the ingredients until the batter is well blended.

If you have one, use an apple peeler/corer/slicer to peel, core, and slice your apples. If not, use a vegetable peeler to peel the apples.

Cut out the cores and slice the apples thinly.

Heat the remaining 3 tablespoons butter in a 10" ovenproof skillet. Add the sliced apples and cook until they are golden brown, 5-10 minutes. (If you'd like, you can add a dash or two of ground cinnamon.)

Put on oven mitts and take the skillet off the heat. Pour the batter over the apples.

Measure 2 tablespoons granulated sugar and 1 teaspoon cinnamon and stir them together in a small bowl. Sprinkle the cinnamon sugar over the batter.

Place the skillet into the oven and cook for 15-25 minutes until gently browned and puffed. (Do not open the oven during the first 15 minutes of the cooking process, or the puff will deflate!)

Put on oven mitts, remove the skillet from the oven, and immediately place an oven mitt over the handle, so that you won't accidentally burn your hand.

Cut the puff into wedges and serve immediately.