Lightly spray the crock of a 5-6 quart slow cooker with non-stick spray.

Cut peaches in half and remove pit. Cut into 1/2-inch slices and place in a bowl. Sprinkle with lemon juice, toss, then set aside.

In a large bowl, combine the brown sugar, salt, oats, flour, baking powder and spices. Mix well.

Cut butter into flour mixture with a pastry blender or 2 knives until it resembles small peas.

Add peaches to flour mixture, mix well and turn into prepared crock pot.

Place a layer of paper towels under the lid to catch condensation.

Cook on low for about 3 hours, or until peaches are soft and oat mixture is brown.