• 1 cup sugar
  • ½ cup cocoa powder
  • 1 cup all-purpose flour
  • 2 teaspoons baking powder
  • ¼ teaspoon salt
  • ½ cup milk
  • 4 tablespoons butter, melted
  • 1 large egg yolk
  • 2 teaspoons vanilla extract
  • ½ cup semisweet chocolate chips
  • 1 cup boiling water


1-Preheat oven to 350 degrees F. Spray an 8-inch square baking pan with cooking spray.

Whisk ½ cup sugar with ¼ cup cocoa powder and set aside.

2-Whisk the flour, remaining ½ cup sugar, remaining ¼ cup cocoa, baking powder, and salt in a large bowl.

Whisk milk, butter, egg yolk, and vanilla in medium bowl until smooth.

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Stir milk mixture into flour mixture until just combined.

Fold in chocolate chips (batter will be stiff).

3-Using a rubber spatula, scrape batter into prepared pan and spread into corners.

Sprinkle reserved cocoa and sugar mixture evenly over the top.

Gently pour boiling water over cocoa.

Do not stir.

4-Bake until the top of the cake is cracked, sauce is bubbling and a toothpick inserted into cakey area comes out mostly clean, about 22-24 minutes.

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