
Rich, deeply caramelized onions are the heart of this dip, and the slow 35–45 minute cook time is what separates it from anything you'd find in a packet. The onions turn jammy and golden, then get a hit of Worcestershire sauce, apple cider vinegar, and garlic powder before folding into a creamy base of softened cream cheese, sour cream, and mayonnaise. The result is bold, savory, and a little tangy — the kind of dip that disappears fast at a party. Store-bought versions of this classic are notorious for hidden thickeners and flavor additives that can sneak gluten into an otherwise simple recipe, so making it from scratch puts you fully in control. Every ingredient here is naturally free of wheat and gluten-containing grains, so there's no swapping or substituting required. It serves eight, making it an easy crowd-pleaser for game days, holiday spreads, or any gathering where you need something everyone can dig into. Serve it cold with gluten free crackers or a pile of fresh crudités and watch it vanish.
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Melt the butter with the olive oil in a large skillet over medium heat until the butter is foamy. Add the sliced onions and 1/2 tsp kosher salt, then stir to coat.
Cook the onions, stirring every 3–4 minutes, until they are deeply golden brown and jammy throughout, 35–45 minutes. Reduce the heat to medium-low if the onions begin to darken too quickly at the edges before the centers have softened.
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