You are here: Home » Recipes » Caramelized Onions Caramelized Onions Recipe by Relish Contributor Yield 1 cups Caramelized onions make any dish feel a bit more special, and they are a breeze to make. Throw everything in a dish and bake for an hour…that's all! PrintEmail Ingredients 1 large onions (about 1 1/2 pounds)2 tablespoons olive oil1 tablespoon butter1 tablespoon fresh (or 1 teaspoon dried) thyme leaves1/2 teaspoon coarse salt1/4 teaspoon freshly ground black pepper Instructions Preheat oven to 325F. Cut onions vertically in half; slice thinly into half-circles and transfer to a large bowl. Add oil, butter, thyme, salt and pepper; toss well. Transfer onions to a shallow casserole dish or roasting pan. Roast 60 minutes, mixing occasionally, or until browned. Cool to room temperature. Transfer to jar, cover and refrigerate up to one month. Makes about 1 cup.