Preheat oven to 350 degrees. Prepare an 8×8 pan by lining with parchment paper(so that the bars can be lifted out) sprayed or brushed lightly with oil. Set aside

In a small bowl combine the oats, flour, walnuts, baking soda and baking powder, sea salt and cinnamon.

In a larger bowl, stir together the oil, milk, sugar and vanilla until combined.

Add the dry ingredients to the oil and milk mixture. Stir well until completely incorporated.

Pour slightly more than half of the batter into the prepared 8×8 pan. Spread out so that the mixture covers the bottom of the pan.

Place pan in the oven and bake for 10 minutes until partially cooked.

Remove from the oven, spread the apple butter evenly almost to the edges of the pan. Using a spoon, drop small amounts of the remaining batter over the top of the apple butter as evenly as possible.

Return to the oven and bake for 18-20 minutes until golden.

Remove from the oven and cool 15 minutes before lifting the edges of the parchment paper to remove the bars from the baking dish. Place the bars(and the paper) directly on a wire rack and cool completely before cutting and serving.