Preheat oven to 375°F and line a sheet pan with parchment paper.
In a large bowl, combine ground chicken, egg, panko, grated Parmesan, shredded mozzarella, and Italian seasoning. Mix just until combined; do not overwork.
Roll the mixture into 20 evenly sized meatballs (about 1.5 inches) and arrange on the prepared sheet pan with space between.
Bake for 20 minutes, or until the internal temperature reaches 165°F and tops are lightly golden.
Meanwhile, boil salted water and cook pasta 1 minute less than package directions. Reserve 1/2 cup pasta water, then drain.
Steam broccoli florets for about 4 minutes, until bright green and tender-crisp. Rinse briefly under cold water to stop cooking and keep color.
For Alfredo option: blend cottage cheese, reserved pasta water, butter, Parmesan, garlic, lemon juice, salt, pepper, and a pinch of nutmeg until completely smooth.
Let meatballs, pasta, broccoli, and sauces cool to room temperature for about 20 minutes to prevent condensation in containers.
Portion into 5 containers: 4 meatballs, about 1 cup pasta, and a handful of broccoli per container. Add either marinara or Alfredo in a small separate cup.
Label with the date and refrigerate up to 4 days. Freeze meatballs and sauce separately if storing longer.