(I usually triple this)
4 large apples (it's nice to use a variety: fuji, granny smith, gala etc.)
Juice from 1 lemon
1 tsp. vanilla
1 T. brown sugar
1/4 c water
Peel and core apples. Cut into large chunks. Place apples and rest of ingredients on low for 4-6 hours. I like to add more cinnamon, more brown sugar and some nutmeg. You can taste it after it cooks and adjust the spices to your liking.
I like to can this applesauce, but it does make a small batch. So to do a large amount of apples borrow some crock pots and get them all working to make a larger batch to can.