Prepare your oven and pan: Preheat the oven to 375°F / 190°C.

Grease an 8-inch square baking pan or line it with parchment paper for easy removal.

Mix the batter: In a large mixing bowl, combine the peanut butter, eggs, chocolate chips, erythritol, baking powder, vanilla, and stevia.

Using a wooden spoon or spatula, stir until the are well combined into a thick batter.

Bake to perfection: Spread the mixture evenly into your prepared pan.

Bake for 14 to 16 minutes, until the edges are lightly browned and the center appears set. Watch them closely after 14 minutes to prevent overbaking.

Cool completely: Allow the bars to cool completely in the pan on a wire rack. They will be very soft out of the oven but will firm up as they cool.

Once fully cooled, cut into 12 bars. Leftovers can be stored in an airtight container for up to a week.

Do not overbake! The key to a chewy, fudgy texture is to pull the bars from the oven when the center is just set. They will continue to cook and firm up in the hot pan as they cool.

Let them cool completely. This step is non-negotiable!

Cutting into the bars while they are still warm will cause them to crumble.

Patience is rewarded with perfectly firm, sliceable bars.