Empty 2 (16oz.) bags of frozen mixed berries into a large bowl. Remove strawberries and quarter them and put back into bowl.
Peel 2 large apples, cut in half and cut out cores. With a large grater grate apple halves into mixed berries.
Melt 1 T. butter and combine with fruit. Add 1 T. honey, 1/2 t. salt, 1 t. vanilla extract, and 1 T. cinnamon. Mix. Add 1 cup granulated real maple sugar (can substitute with 1 cup Splenda if desired). Combine thoroughly. Add 3 heaping T. corn starch and finish blending together. Empty into a Corningware casserole dish with a lid.
In a medium glass (Pyrex) bowl melt 6 T.butter. Add 1 t. vanilla extract, 1/2 t. salt, 1 T. Cinnamon. Blend together. Add 1/4 cup real maple sugar (can substitute with brown sugar or brown sugar Splenda). Mix together. Add 1 3/4 cup Quick Oatmeal combining together to a moist crumbly mixture. Carefully toss over top of apple-berry mixture evenly.
Place in a preheat 375 degree oven and bake covered 30 minutes. Remove lid and bake another 30 minutes. (For a thicker consistency, do not cover and bake 60 minutes uncovered). Cool at least 3 hours before serving. Can easily make a day ahead refrigerated. Always refrigerate leftovers.