Heat oven to 425. Pierce the potato with a fork, then place directly on the middle oven rack. Bake for 1 hour, or until tender.
Reduce the oven to 375. Carefully slice the hot potato in half lengthwise, then scoop out the flesh into a bowl. Gently fold in the cream cheese and milk until the potato is fluffy and creamy, adding more milk if necessary. Do not overmix.
Fold in 2 teaspoons vegan Parmesan, the spinach, artichokes, sun-dried tomatoes, parsley, lemon, red pepper flakes, salt and pepper. Taste and adjust accordingly.
Fill the potato skins with the mixture, then sprinkle with 2 teaspoons Parmesan and the feta.
Place on a baking sheet and bake for 30 minutes or until hot and melty.
Sprinkle fresh parsley on top before enjoying.