Line large cookie sheet with foil; spray foil with cooking spray.
In small bowl, mix sauce ingredients with whisk until smooth.
Cover; refrigerate until serving time.
In colander, place zucchini and ½ teaspoon of the salt; gently toss.
Place colander over bowl or sink; let drain 10 minutes.
Place zucchini on cheesecloth or paper towel; wrap cheesecloth around zucchini and twist gently to remove as much remaining moisture as possible.
In large bowl, mix sweet potato and eggs with whisk until smooth.
Add zucchini, bread crumbs, cheeses, onion, garlic powder, thyme, parsley, pepper and remaining ½ teaspoon salt; blend gently with fork.
For each tot, gently roll 1 tablespoon mixture in palm of hand into small oval or log shape.
Place about 1 inch apart on cookie sheet.
Bake 15 to 18 minutes, turning once, until crisp and golden brown.
Serve hot with sauce.
Notes / Tips / Wine Advice:
Make-Ahead Magic The Sweet Potato–Zucchini Tots can be frozen up to 1 week before serving. Bake as directed, cool and place in resealable freezer plastic bag or freezer container. To reheat, place frozen tots on a cookie sheet. Bake at 350°F for 13 to 15 minutes or until thoroughly heated.