Unsalted butter: 6 tbsp ≈ 84 g
Dark chocolate (chopped): 6 oz ≈ 170 g
Granulated white sugar: 1/2 cup ≈ 100 g
Light brown sugar (packed): 1/2 cup ≈ 110 g
Large eggs: 2 ≈ 100 g total
Vanilla extract: 1/2 tsp ≈ 2.5 g
Coffee extract (optional): 1/8 tsp ≈ 0.6 g
All-purpose flour: 3/4 cup ≈ 90 g
Unsweetened cocoa powder: 1/4 cup ≈ 22 g
Baking powder: 1/2 tsp ≈ 2.5 g
Salt: 1/4 tsp ≈ 1.5 g

a popular and effective egg substitute is the flax egg. Here’s how you can make it:

Flax Egg Recipe:

1 tablespoon ground flaxseed
3 tablespoons water
Mix the ground flaxseed with water in a small bowl.
Let it sit for about 5–10 minutes until it thickens and becomes gelatinous.
Use it in place of one egg.