Heat oven to 350.
Place squash halves cut-side down on a rimmed dish.
Add 2 cups water to the dish and bake at 350 for 40 minutes.
Meanwhile cook bacon in a large non-stick skillet over medium heat for 4 minutes.
Add onion and apple to the skillet. Cook for an additional 4 minutes, stirring occasionally.
Stir in ground beef to the skillet. Cook breaking apart with a wooden spoon, 5 minutes.
Add brown sugar, spices, salt and pepper. Cook 1 minute.
Remove from heat and stir in bread crumbs.
Drain water from baking dish and flip over squash.
Spoon meat mixture into squash halves.
Return to oven and bake at 350 for 20 minutes. Serve warm.