Follow these steps carefully to create your delicious Chocolate Peanut Butter Oatmeal Bars:

1. Preheat your oven: Set your oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper.
2. Mix Oats and Cocoa: In a large bowl, combine rolled oats, cocoa powder, and salt. Stir until well blended.
3. Combine Wet Ingredients: In another bowl, mix together peanut butter, honey or maple syrup, and vanilla extract. Stir until smooth and creamy.
4. Combine Mixes: Pour the wet mixture into the dry ingredients. Mix well so that the oats are thoroughly coated.
5. Add Optional Ingredients: If using, fold in the mini chocolate chips and nuts for added flavor and texture.
6. Spread in Pan: Transfer the mixture into the prepared baking pan. Press firmly into an even layer using a spatula.
7. Bake: Place in the preheated oven and bake for 20-25 minutes, or until the edges begin to look slightly crispy.
8. Cool: Remove from the oven and let the bars cool in the pan for about 20 minutes. After that, lift them out using the parchment, and let them cool completely on a wire rack.
9. Cut into Bars: Once cooled, cut the mixture into bars or squares of your desired size.
10. Enjoy: Serve them as is or sprinkle additional chocolate chips on top for an extra special touch.

These simple steps ensure success in creating indulgent yet healthy Chocolate Peanut Butter Oatmeal Bars.