This recipe can be made into a complete lean and green by increasing the cauliflower rice to 5 cups or 3 cups cauliflower rice and 2 cups zucchini cubes. And increase the Raos to 2 cups.
The breakdown then would be  

Preheat oven to 350.
Place the cauliflower rice in a 2.5-quart baking dish. Microwave 4-5 minutes or until tender but not mushy.
After cooking, set aside (leave in the casserole dish).
In a large skillet or pot, cook the ground beef over medium-high heat until browned, 7-10 minutes.
Drain and stir in the tomato sauce, salt, and pepper.
In a mixing bowl, stir together the cottage cheese and sour cream. Mix in the sliced green onions.
Pour the sour cream mixture into the cauliflower rice (that’s in the casserole dish) and mix well.
Pour half of the beef mixture over the cauliflower rice mixture.
Spread with the back of a spoon to even. Top with 1 cup of the cheddar cheese.
Repeat with the remaining beef mixture