Blend the cottage cheese until completely smooth, or press it through a fine mesh sieve. This keeps the cake silky instead of grainy.
In a large microwave safe mug, whisk together the smooth cottage cheese, egg, maple syrup and vanilla extract.
Add the cocoa powder, flour, baking powder and salt and whisk until no dry lumps remain.
Sprinkle the chocolate chips on top and microwave for 70-90 seconds, until the cake is just set with a slightly soft center. The cottage cheese keeps it moist and fudgy instead of rubbery.
Let it rest for 1 minute, then enjoy warm straight from the mug.