Preheat oven to 375F. Grease an 8x8 pan.
In a large bowl, mix the dry ingredients (oats, flour, sweetener, spices and salt).
Melt coconut oil (or butter) and allow to cool slightly.
Add coconut oil & vanilla to the dry ingredients and mix until combined. You should be able to form clumps when you pinch the dough together.
Remove 3/4 cup of this mixture and set aside to be used for the crumb topping.
Press the remainder of the dough into a greased 8x8 pan.
Add fresh fruit, frozen fruit or even jam on top of this mixture.
Sprinkle half of the sugar on top of the fruit.
If using fresh or frozen fruit, evenly top the sugared fruit with tapioca or corn starch. Skip this step if using jam or jelly as it doesn't need assistance setting up.
Squeeze approx. half a lemon over the top of the fruit and starch.
With the remaining dough, crumble chunks all over the fruit. There should be fruit peeking through under the clusters of dough.
Sprinkle the remaining sugar evenly over the top.
Bake fruit and oatmeal bars at 375F for approx. 20-30 minutes. Top should be golden brown and set to the touch. Fruit should be thick and bubbly.
Allow to cool for at least 10 minutes before cutting to allow bars to properly set.
Store at room temperature on the counter top for 24 hours and then store in the fridge.