Make The BEST EVER Homemade Caramel Popcorn for crunchy, buttery caramel clusters everyone will love in about 20 minutes.
Place the half-cup of unpopped kernels into your air popper and pop them straight into a large, wide, shallow serving bowl. Work quickly while the popcorn is warm so the heat helps the caramel adhere later — the popped corn should be airy and brittle, with a bright white interior and slightly golden edges; transfer it into the same rustic ceramic serving bowl and set it aside to await the caramel.
In a medium saucepan combine brown sugar, butter and light Karo syrup and bring to a rolling boil over medium-high heat, stirring so the sugar dissolves and the butter melts into a smooth, syrupy amber. Add the sweetened condensed milk and let the mixture simmer softly for about 3–4 minutes until it reaches the soft-ball stage: thick, glossy, and just beginning to pull away from the pan. Remove from heat and stir in the baking soda — it will foam and lighten in color, transforming into an airy, satin caramel with tiny glossy bubbles. Let it rest just long enough so it is pourable but still hot.

Pour the warm, foamy caramel evenly over the prepared popped corn in your shallow rustic ceramic bowl and use a sturdy wooden spoon to fold and toss, scraping sticky trails and ensuring every flake and cluster gets an even, amber glaze. Work with broad, gentle strokes until strands of caramel form delicate clusters; spread the coated popcorn out briefly to cool and set, then gather into the bowl for serving. The finished popcorn should be a mix of single, crisp kernels and tight caramel clusters with a glossy, brittle shell and a warm, buttery sheen.
