Brussel Sprouts Casserole

Scaled for 8 portions · 5 steps

3 slicethick-cut bacon910 gbrussels sprouts1/2yellow onion (finely diced)0.75 tspkosher salt (divided)1 tbspunsalted butter2 tbspall-purpose flour1.5 cup2% milk1 tbspchopped fresh thyme (or 1 teaspoon dried thyme leaves)0.25 tspground black pepper1 pinchground nutmeg (optional)0.5 cupfreshly grated Gruyère cheese (sharp white cheddar cheese, or a similar fully flavored, melty cheese)0.25 cupwhole wheat bread crumbs—Olive oil cooking spray

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