Easy Chocolate Pudding Cakes

Bahan-bahan (4 porsi)

• 1 stick salted butter
• 1/2 cup semi-sweet chocolate chips
• 3.2 ounces dark chocolate, chopped
• 2 eggs, at room temperature
• 2 egg yolks, at room temperature
• 1/3 cup granulated sugar
• 1/4 cup all-purpose flour
• 2 teaspoons instant coffee granules
• 1 teaspoon salt
• 2 teaspoons vanilla extract
• 4 squares semi-sweet or dark chocolate