Preheat oven to 375 degrees F. Place bacon strips on a foil lined cookie sheet. Bake in oven for 15-20 minutes or until bacon reaches desired crispiness.
Butter one side of each piece of bread, smearing the butter to the very edges of the piece of bread.
Place a large flat skillet on burner set to medium heat. Then place two slices of bread, buttered side down, on skillet. Next add half of the brie atop each slice of bread, then add apples on top of the brie. Add second piece of bread, buttered side up, on top of apples.
Grill for approximately 4 minutes, flip sandwiches and grill for another 2 minutes or until bread has turned golden and cheese melted.
Remove from the skillet. Open sandwich on apple side, then add bacon, and serve.