Steps
Preheat your oven to 425°F (220°C).
Grease a small ramekin with butter and lightly dust with flour.
In a bowl, whisk together the egg and sugar until well combined.
Sift in the cocoa powder, flour, and salt, and mix until smooth.
Fold in the chocolate chips until evenly distributed.
Pour the batter into the prepared ramekin.
Bake for 12-14 minutes until the edges are firm but the center remains soft.
Remove from the oven, let it sit for a minute, then carefully invert onto a plate.
Dust with powdered sugar and enjoy warm.