In a large mixing bowl, whisk together flour, cocoa powder, brown sugar, baking powder, baking soda, and salt until well combined.

In a separate bowl, whisk together the egg, milk, and Greek yogurt until blended and creamy.

Gently pour the dry mixture into the wet ingredients and fold together until just combined; the batter should be slightly lumpy.

Preheat a non-stick skillet over medium heat and add a small pat of butter to melt.

Pour 1/4 cup of batter onto the skillet, cooking until bubbles form, then flip and cook until golden brown.

Serve warm with toppings like maple syrup, berries, or chocolate chips.