Melt the butter then stir in the brown sugar. Whisk until well combined.
Place the chopped pecans evenly at the bottom of a pie plate. Pour the brown sugar mixture over evenly. Top with one of the unrolled pie crusts.
In a large bowl place your apple slices. Add the flour, granulated sugar, cinnamon and nutmeg. Mix well to evenly coat the apples.
Dump the apples on top of the pie crust already in the pie plate. Place the second unrolled pie crust over the apples and tuck in the edges.
Bake until the crust is golden. Remove from the oven and once the pie has cooled for 5 minutes, flip it over onto a plate or platter.