• Preheat the oven to 375 degrees.
• Blanch the broccoli quickly and set aside to cool.
• In a heavy bottom 2-qt. saucepan, heat up the butter.
• Once it melts, add the onion, shallots and garlic.
• Saute over medium heat until translucent and add the thyme.
• Slowly stir in the flour and saute for an additional 2 minutes.
• Stir in the stock and milk, whisking out any lumps.
• Stir in the Dijon and the nutmeg.
• Bring up to a simmer and season to taste, taking the broccoli, potatoes and cheese into account.
• Toss the broccoli and potatoes together and place in a 13 x 9 casserole dish.
• Pour the sauce over the broccoli and potatoes and sprinkle with the cheese.
• Top with breadcrumbs and bake for 30 minutes at 375 degrees.
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