Preheat the oven to 375°F (190°C) and generously coat a standard 12-cup muffin tin with non-stick cooking spray.
In a large mixing bowl, combine the cooked brown rice and steamed broccoli florets.
In a separate bowl, whisk together the blended cottage cheese, liquid egg whites, Greek yogurt, garlic powder, onion powder, salt, and pepper until uniform.
Fold the wet mixture and 1 cup of the shredded cheddar cheese into the rice and broccoli until thoroughly incorporated.
Spoon the mixture into the prepared muffin tin, filling each cup to the top and pressing down firmly with the back of a spoon to pack.
Sprinkle the remaining 1/2 cup of shredded cheddar cheese evenly over the tops of the 12 cups.
Bake for 22 to 25 minutes, or until the cheese is bubbling and the internal structure is set.
Remove from the oven and allow to rest in the pan for at least 10 minutes to ensure structural integrity before extraction.