Easy Roasted Onions Recipe

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2 tablespoons butter (plus more for the pan)

1 medium onion

½ teaspoon Diamond Crystal kosher salt

Preheat your oven to 400°F. Grease a square 8-inch Pyrex baking dish with butter.
Peel the onion and slice it into ¼-inch-thick slices. You should get five slices.
Arrange the slices in a single layer in the prepared baking dish. Melt the butter and pour it over the onions. Sprinkle them with kosher salt.
Roast the onions until the bottoms are golden, about 20 minutes.
Turn the onion slices to the other side and bake them until golde brown, about 20 more minutes.
Serve immediately.