Preheat oven to 350°F degrees. Prepare a 9x13-inch baking dish with a coating of butter or nonstick cooking spray. Set aside.
Add the almond flour, baking powder, salt, erythritol, eggs, melted butter, and water to a blender or food processor. Blend or pulse until the batter is smooth and all ingredients are fully combined, scraping down the sides as needed.
For best texture, let the batter rest for 5 minutes to allow the almond flour to fully hydrate and thicken.
Transfer the batter to the prepared baking dish. Sprinkle chocolate chips on top.
Bake uncovered for 18-22 minutes, or until the top is set and a toothpick inserted in the center comes out mostly clean. Avoid overbaking to keep the pancake moist.
Remove from oven and let the pancake rest in the baking dish for 5-10 minutes
Cut into 8 equal squares. Serve with sugar-free maple syrup, if desired.