Preheat your oven to 350°
Combine 4 medium peeled and diced apples with 2 tablespoons of all purpose flour, 1/2 cup of brown sugar, 1 teaspoon of ground cinnamon and 2 tablespoons of apple cider or lemon juice in a large bowl. Mix until everything is evenly distributed and set aside for now
In a large bowl, combine 8 tablespoons of melted butter with 2 large eggs, 3/4 cup of brown sugar, 1/4 cup of apple sauce, 1/2 cup of greek yogurt or sour cream and 2 teaspoons of vanilla extract in a large bowl and whisk until fully combined
Add 2 cups of all purpose flour, 1 teaspoon of baking powder, 1/4 teaspoon of baking soda, 1/2 teaspoon of salt, 1 teaspoon of ground cinnamon and 1/2 teaspoon of nutmeg and mix until just combined
Add about half of the cake batter into a generously greased 9-10” oven safe skillet or deep baking dish
Spread half of the apples over the batter and cover the apples with the remaining batter
Spread the remaining apples and juices over the top of the batter and sprinkle with course sugar (optional)
Bake uncovered in a 350° oven for 50-55 minutes or until a toothpick will come out of the center of the cake mostly clean
Transfer the baking dish onto a cooling rack to cool for about 10 minutes
While the cake is cooling, whisk 1-2 tablespoons of apple cider and a tablespoon of heavy cream or milk into 1 1/2 cups of sifted confectioners sugar until smooth
Drizzle the glaze over the warm cake and enjoy