Preheat oven to 350 degrees F.
Sift together flour, cocoa powder, salt.
Melt butter in saucepan.
Add cocoa powder. It's easier if you sift cocoa powder right into the melted butter in saucepan.
Mix in until well incorporated.
Cool for a few minutes.
Whisk in eggs, one at a time.
Add in swerve, vanilla, coffee.
Gently mix together.
Add chopped dark chocolate or chocolate chips.
Bake for thirty minutes at 350. After 10 minutes, add chocolate chip, by sprinkling over the top.
You can also add sprinkles at this point. Continue to bake until finished cooking time or until a toothpick comes out clean.