This is not the proper way to steam broccoli. By all means, check the 8 million Google search results for steaming frozen broccoli. Or read the back of the package. This is my lazy/fast way to cook frozen vegetables.
While the pasta for the macaroni and cheese (recipe here) is simmering, Fill a medium size pot with 2-3 inches of water. Set it over medium-high heat. Pour frozen broccoli into the water. Cover with the lid and bring water to a boil.
Stir it into the macaroni and cheese and serve.
FLAVOR TIP: Instead of using frozen broccoli, saute 1/4 cup each finely chopped onion and peppers with finely chopped fresh broccoli. When the onion is translucent and broccoli is tender, stir it into the macaroni and cheese.
The One with Broccoli https://www.cheapskatecook.com/modified-macaroni-cheese-4-ways/