Method:
Preheat oven to 400°F. Line a baking sheet with parchment paper and coat with cooking spray. In a large bowl, combine potatoes, carrots, onion, egg, flour, salt and pepper and stir well. Heat a tablespoon of olive oil in a skillet over medium heat. Scoop potato mixture, 1/3 cup at a time, and press out the liquid. Transfer to the the hot pan, pressing down slightly to form a patty. Add as many pancakes as will fit into pan without crowding and cook 4 to 5 minutes per side or until browned. Transfer to prepared baking sheet. Repeat with remaining oil and potato mixture. Note there will be liquid in the bottom of the bowl--this should be discarded.
Bake pancakes 15 to 20 minutes or until cooked through and crisp. Meanwhile, to make the yogurt dill sauce, stir together yogurt, dill and green onion. Serve pancakes with yogurt dill sauce.