Dark Chocolate Popcorn

Step 1
Preheat oven to 250 degrees F (120 degrees C). Grease a 9×13-inch baking dish.

Step 2
Bring sugar, butter, cocoa powder, and corn syrup to a gentle boil in a saucepan; cook until thickened, 1 to 2 minutes. Stir in vanilla extract. Pour popcorn into a large bowl, add cocoa mixture and stir until popcorn is well coated. Spread evenly in prepared baking dish.

Step 3
Bake in the preheated oven, stirring occasionally, until mixture is set, about 30 minutes.

Step 4
Remove from oven and cool to room temperature; break into clumps.