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Everyday activities such as cooking a meal are natural opportunities for “challenging” family talk, which promotes cognitive development by prompting explanations and elaborations. Our study investigates a light intervention to increase the frequency of challenging family STEM talk during an everyday activity. Sixty-two families with children (mean age = 9.49) recorded their conversations while popping popcorn using either a standard recipe or a recipe with embedded wh-question prompts (e.g., Why did some kernels not pop?). Conversations were transcribed and coded to measure four qualities of challenging STEM talk: STEM words, STEM explanations, spontaneous questions, and elaborations (or interactive turn-taking). The results demonstrate that families who received wh-question prompts embedded into the recipe produced 3–5 times more instances of challenging STEM talk than families who received no prompts. These results provide evidence for a light intervention that increases family STEM talk through a familiar, everyday activity.