1/3 cup water
4 tablespoons butter, melted
1 package (18.25 ounces) Betty Crocker triple chocolate fudge cake mix
1 large egg
3/4 cup semisweet chocolate chips
Preheat the oven to 350 F.
Place the water, butter, cake mix, and egg in a large mixing bowl. Blend with an electric mixer on low speed for about 1 minute. Stop the mixer and scrape the sides of the bowl with a rubber spatula. Beat for a minute longer on medium speed. This dough will be thick. Fold in the chocolate chips with a rubber spatula until well distributed.
Place a silicone baking mat on a cookie sheet or lightly grease the cookie sheet.
Form the cookie dough into small balls. Roll these balls in confectioner's sugar and place on the silicone baking mat or cookie sheet.
Bake the cookies for about 10-12 minutes.
Once the cookies are done baking, let them rest for about a minute before placing them on wire racks to cool. Store in an airtight container.
Source: adapted from The Cake Mix Doctor