Slightly undercook these mouthwatering morsels for a molten effect.
Ingredients
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1
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1
1
1
2
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Preparation
Step 1
Preheat oven to 375° with racks in center and upper third. Line 2 baking sheets with parchment.
Step 2
Whisk together flour, sugar, cocoa powder, baking powder, salt, and espresso powder (if using). Rub butter into dry ingredients until mixture resembles breadcrumbs. Stir in chocolate.
Step 3
Whisk together egg and vanilla. Add egg mixture to chocolate mixture; stir with a fork until mixture is slightly moistened. Form dough into a ball; wrap in plastic; refrigerate 30 minutes.
Step 4
Shape dough into tablespoon-size balls. Roll each in powdered sugar to coat; place on sheets 2" apart. Bake until just set but still slightly undercooked, about 10 minutes. Let cool on sheets 5 minutes; transfer to wire racks to cool completely. Serve warm.