Add vegetable broth and 2 tablespoons tomato paste, and stir until combined and the tomato paste is dissolved. Bring to boil.
When sweet potatoes are ready for mashing, transfer to large bowl or mash directly on baking sheet. Mash with fork or potato masher until completely broken up and smooth with just a few chunks.
Place skillet on rimmed baking sheet. Bake about 15 minutes uncovered until top is golden-brown and edges are bubbling. Sprinkle with more dried parsley, if desired.