1. Preheat the oven to 350? F. Grease a 13 x 9 by 2-inch baking pan and set aside. In a large bowl, beat together peanut butter, butter, brown sugar and sugar with an electric mixer until combined and fluffy. Mix in eggs, applesauce and vanilla.
2. In a separate bowl, combine flour, oats and baking soda. Gradually add dry ingredients to the creamed mixture and beat until combined.
3. Bake until brownies are golden and puffed on the top, around 35-40 minutes. Insert a toothpick to test — it should come out dry.
4. Cool completely on a rack.

Make the ganache:

1. Place chocolate chips in a heatproof bowl.
2. In a small saucepan, bring cream to a boil and pour over chocolate chips. Let sit for 1 minute. Whisk in the butter and stir until chocolate is melted and smooth.
3. Spread ganache over the brownies and let stand until the chocolate has set, about 20 minutes.