Preheat electric griddle to medium heat (or about 350 degrees F), or a large skillet on the stove stop. You want the surface to be hot but not screaming hot – oil shouldn’t smoke when it makes contact with the surface.
To a large mixing bowl add flaxseed and water and let set for a minute or two. Then add melted coconut oil, agave nectar (or honey/maple syrup), baking soda, baking powder, salt, vanilla extract and whisk to combine. Add almond milk (starting with 3/4 cup and adding a touch more if needed) and whisk again until well combined.
Divide batter in half and add cocoa powder to one bowl and peanut butter to the other. Mix until just combined. Add more almond milk if too PB made it too thick. You want a pourable batter that's not "gloppy."
Once the griddle is hot, lightly grease and spoon on scant 1/4 cup measure of chocolate batter, then scant 1/4 cup of peanut butter in the center. Cook until the edges appear dry and bubbles form on top, then carefully flip. Cook for another 2-ish minutes on the other side. Will make 5-6 pancakes.