Blend together egg and spinach leaves until everything looks smooth. You can use an immersion blender or a food processor.

Add flour until dough forms a nice ball. Let the dough ball rest for at least an hour.

Roll out on flour surface or run dough through a pasta maker attachment, dusting with extra flour if the dough is too sticky.

Lay out large sheets of pasta on a floured counter and dust the top with flour. Let the pasta dry out for about 10-15 minutes.

Cut slightly dry pasta with a knife or run sheets through a pasta attachment on a stand mixer into the desired shape. Let cut pasta dry out on counter for another couple of hours or in a dehydrator. You can also put in a bag and set in the freezer.