In a medium size bowl, combine the flour, salt, baking soda, brown sugar and oats. Using a pastry cutter, cut in the cold butter cubes until the mix resembles coarse crumbs.
Spray an 11x7" (or 8x8") baking dish with cooking spray. You can also line the pan with parchment paper so that it comes out cleanly if you'd like.
Press half the oat mixture in the bottom of the prepared pan in an even layer.
Arrange the apple slices on top of the pressed crumbs.
Sprinkle the white sugar on top of the apples, then drizzle the 2 tablespoons of melted butter over the sugar.
Top with the remaining oat mixture and press down gently on the top with your hand.
Bake for 30 minutes or until golden brown.
Store in an airtight container in the refrigerator.
Video
Notes
*I used Granny Smith apples, but Honeycrisp or Gala also work.*Make this recipe gluten-free by using gluten-free oats and all-purpose flour.*Use dairy-free butter for a vegan dessert recipe.The calories shown are based on the recipe making 10 bars, with 1 serving being 1 bar. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**