Wash the broccoli well. Cut into small florets. Boil in salted water for three minutes. Drain quickly and set aside. Do not overcook. The broccoli should stay bright green and slightly firm.

Melt butter in a pot over medium heat. Add flour and whisk until smooth paste forms. Slowly pour in milk and cream. Stir constantly until thick and creamy with no lumps.

Turn heat to low. Add shredded cheddar cheese slowly. Stir until melted fully. Add garlic powder, salt and black pepper. Mix well until the sauce becomes smooth and rich.

Place cooked broccoli into a large bowl. Pour the warm cheese sauce over it. Gently mix until every piece of broccoli is covered with creamy cheese sauce evenly.

Grease a baking dish lightly with butter. Pour the broccoli mixture into the dish. Spread it evenly using a spoon so it cooks the same on all sides.

Sprinkle crushed buttery crackers evenly on top. This gives a crispy golden layer. It adds nice texture and flavor to the soft and creamy casserole.

Preheat oven to 350°F (175°C). Bake for 25–30 minutes. The top should turn golden brown and slightly crispy. Let it rest five minutes before serving warm.