This Broccoli Rice Casserole is the perfect side dish for dinner or Thanksgiving. I love to add crushed Ritz crackers on top for extra flavor and crunch. I made it for a potluck last week and it was the unexpected star of the event.
Bring a large pot of water to a boil. Add the broccoli and cook for 2 minutes. Immediately submerge the broccoli in water to cool down. Drain in a colander.
In a large nonstick pan, melt the butter over medium-high heat. Add the onions and garlic. Cook for 5 minutes until the onions are translucent. Add the flour and stir until evenly incorporated.
Slowly pour in the milk and whisk until thickened. Stir in 2 cups of cheddar cheese, black pepper, salt, and dry mustard powder. Remove from the heat.
Combine the cheese sauce with the broccoli and cooked rice. Transfer to a casserole dish. Top with the remaining ½ cup of cheese and Ritz crackers.
Bake for 35-40 minutes until the cheese is lightly browned and the sides are bubbling.