01 -
Position a rack in the center of the oven and preheat to 175°C. Grease a 2.5-quart (approx. 2.4 L) casserole dish with cooking spray or butter.
02 -
In a large saucepan over medium heat, melt half of the butter. Add sliced shallots and chopped garlic. Cook, stirring occasionally, until softened, about 3 to 5 minutes, without browning.
03 -
Whisk in the flour, coating the aromatics evenly. Continue to cook, stirring constantly, for 1 to 2 minutes until the mixture becomes lightly golden and fragrant.
04 -
Gradually whisk in whole milk and half-and-half. Add kosher salt and freshly ground black pepper. Reduce heat to low and simmer, stirring frequently, until slightly thickened, about 3 to 5 minutes.
05 -
Remove from heat and stir in 360 g (3 cups) of shredded sharp cheddar until fully melted and smooth.
06 -
Place broccoli florets evenly in the prepared casserole dish. Pour the cheese sauce over the broccoli, ensuring even coverage. In a small bowl, combine panko bread crumbs with the remaining 120 g (1 cup) shredded cheddar cheese. Sprinkle this mixture evenly on top.
07 -
Cover the dish with foil or a lid, and bake in the preheated oven for 20 minutes. Remove the cover and continue baking for an additional 10 to 15 minutes until the topping is golden brown and the casserole is bubbling.
08 -
Remove from oven and let rest briefly. Serve warm as a rich side dish or accompaniment.