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Export 11 ingredients for grocery delivery
Step 1
Preheat the oven to 375 degrees F. Grease a 9x13 rectangular baking dish and set aside.
Step 2
Place the sliced potatoes in a large pot and cover with salted water. Make sure you cover the potatoes by at least a couple of inches, so that there is room in the pot for the cauliflower to cook too. Bring the pot with the potatoes to a boil, add in the cauliflower florets, and cook for 8 to 10 minutes until the potatoes are soft but not falling apart. Drain.
Step 3
While the veggies are cooking, melt the butter in a saucepan over medium heat. Whisk in the flour to form a paste. Slowly pour in the milk followed by the broth, whisking constantly. Cook for a few more minutes, whisking often, until the sauce thickens. Stir in the Dijon mustard, onion powder, garlic powder, salt, and pepper.
Step 4
Turn off the heat on the sauce. Stir the parmesan cheese and ¾ cup of the cheddar cheese into the sauce.
Step 5
Transfer the cooked veggies to the greased baking dish and spread out in an even layer. Pour the cheese sauce over the veggies.
Step 6
Sprinkle the casserole with the rest of the cheddar cheese and the sliced chives. I like to use kitchen shears to quickly cut the chives over the casserole.
Step 7
Bake for 20 to 25 minutes until the sauce is bubbling and the cheese is slightly browned. Flip the broiler on and finish baking the dish for 2 to 3 more minutes until the cheese is fully browned.
Step 8
Remove from the oven and garnish with more fresh chives as desired. Let it sit for 5 to 10 minutes before serving.
Step 9
Leave a rating or review by tapping the stars on this recipe card (above) or in the comments section (at the end of the post)!
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