Line an 8 inch by 8 inch baking pan with parchment paper.
Add chocolate chips and applesauce to a large microwave-safe mixing bowl. Heat at full power in 30 second intervals, stirring in between with a spatula, until chocolate is completely melted. I needed to heat my mixture twice, for a total of 1 minute cooking time. Once chocolate is fully melted, switch to a whisk and stir until the applesauce is fully mixed in with the chocolate and the mixture is uniform in color.
Stir in the oats until they are evenly mixed in and fully coated in the chocolate mixture. The mixture will still be very wet and resemble a thick batter.
Transfer the mixture to your prepared baking pan. Use a spatula to evenly spread it across the pan and smooth the surface. Place the pan into your fridge until the chocolate is set and no longer melted. (This can take 30 minutes to an hour).
Use a large sharp knife to slice the bars. Serve immediately. Store any uneaten bars in the fridge or freezer.
Notes
8 oz of applesauce refers to weight not volume. 8 oz of applesauce is slightly under 1 cup of applesauce. It is 3/4 cup + 2.5 tbsp for those who don't have a scale. Alternatively, in the US, the snack cups of applesauce are usually sold in 4 oz cups and you would need two of them to make this recipe.
I have only tested this recipe with unsweetened applesauce.
The applesauce must be fully incorporated into the chocolate, otherwise the chocolate will harden back to its original state.
Do not use milk chocolate or white chocolate instead of semisweet chocolate. The bars will not set.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.