Combine stock and milk in a sauce pan and bring to a low boil.
Slowly whisk in grits and cook according to package directions.
Meanwhile, add onion, spinach, garlic, oregano, nutmeg and pepper to a food processor and pulse until very finely chopped. NOTE: If you don't have a food processor, just finely chop the onion, spinach, and garlic instead.
Stir spinach mixture and cottage cheese into the cooked grits then immediately spoon into 24 large muffin cups sprayed with non-stick spray. About 1.5 tbsp each.
Pop the trays into the freezer and freeze until firm, about 2 hours.
Once frozen, remove the cakes from the cupcake tin and store in a large freezer bag.
Reheat in the microwave in 30 second increments until warm.
Serve as is or break into appropriate pieces with a small serving of your baby's favorite veggies.