Fill a large pot with water and add a few teaspoons of salt.
Bring to a boil.
Add pasta, stir, and reduce heat to simmer.
Cook according to pasta instructions (my pasta took 13 minutes to cook)
In the meantime, heat a skillet to medium heat and saute garlic and onions until onions are translucent.
Use a little vegetable broth so the onions and garlic don't stick.
Add mushrooms and continue cooking with the onions and garlic until mushrooms are browned.
Now, add the sliced baby bell peppers
Add vegetable broth as needed, so vegetables don't stick.
Add salt and pepper to taste.
When the pasta has 5 minutes remaining, add the raw broccoli to the pasta water and stir.
When the time is up to drain the pasta, drain the pasta and broccoli together in a colander.
Add noodles and broccoli back to the pasta pot.
Then, add sauteed mushrooms, onions, and baby bell peppers.
Next, pour the cheese sauce over the noodles and vegetables.
Stir, and serve.