low sodium chicken stock • cans kidney beans, rinsed and drained • unsalted butter • kosher salt, divided • freshly ground black pepper, divided • olive oil • medium shrimp, peeled and deveined (about 24) • sweet chili sauce • pkg. precooked brown rice • chopped fresh cilantro • ripe avocado, sliced • crumbled Cotija cheese (Cotija is a hard cow's milk cheese much like Parmesan) •