Set oven to 375F.
Cook chicken breast in a nonstick skillet with no seasoning. Tear into pieces and set aside.
In a bowl, mix chicken, broccoli, brown rice, red onions, Greek yogurt, chicken broth, mozzarella and Italian seasoning
Evenly divide among the jars or a large casserole dish.
Top with wheat breadcrumbs or amaranth flakes. Bake for 25 minutes at 375F.