Preheat oven to 400 degrees. Place cast iron pan in oven to preheat for 30 minutes.
Combine dry ingredients in a bowl:
3/4 Cup Flour
1/4 Cup Cocoa Powder
1 Cup Maple Sugar
1/2 tsp Salt
2 tsp Vanilla Extract
Combine wet ingredients in a smaller bowl:
2 Large Eggs
5/8 Cup Butter, melted
1 Cup Dark Chocolate Chunks
Gradually add the dry ingredients to the wet ones.
Pour into the hot cast iron pan and cook for 20-30 minutes, until a toothpick comes out clean.