- Preheat the oven to 400 degrees F. 
- Butter a 9x13 casserole dish and set aside. 
- Grate zucchini on the large holes and transfer to a colander placed over the sink. Sprinkle with 1 teaspoon salt and stir. Let stand for 15 min, then squeeze out the excess moisture with your hands. Transfer drained zucchini to a large mixing bowl. 
- In a small bowl mix sour cream, lemon juice, and 1/2 teaspoon baking powder. 
- Stir in the eggs and sour cream mixture into the shredded zucchini. 
- Add cooked shirataki rice, 1 cup of cheddar cheese, and 1 cup of mexican cheese. 
- Stir in the green onions, remaining 1/2 teaspoon salt, minced garlic, paprika and onion powder. 
- Pour mixture into the prepared casserole dish, spread the yogurt over the top. Bake uncovered for 20 minutes. 
- Sprinkle remaining 1 cup of mozzarella cheese and cheddar cheese on top and bake uncovered on the center rack in the preheated oven for 20-30 minutes. 
- Let stand for 10 minutes before serving. 
- Garnish with sour cream, chopped tomatoes, green onions, and serve.