Pour filling on top of oat mixture. Spread evenly over oat mixture.
Sprinkle remaining oat mixture over applesauce.
Bake in a preheated 325° oven for 40 - 45 minutes.
Allow bars to fully cool before slicing into 12 equal pieces.
Tips for making
Use salted butter that is softened. The butter should be soft enough to spread easily on a slice of bread
Use old fashioned oats, which are a bit thicker than a quick oat.
Some people prefer not quite as much applesauce filling. You can use 1 ½ cups instead of the 2 cups.
Allow bars to cool before slicing
Store any leftover bars in a covered container
If you don't have a food processor:
First, you can place the crust ingredients in a bowl and mix using a mixer with beaters. Make certain the butter is very soft, but not melted.
Second you could mix with your hands. Place ingredients in a bowl and use your hands or your fingers to mix. This may be a bit messy, but your hands are really a great kitchen tool. Simply use your fingers to mash butter into the flour and oat mixture.