Bake the bars at 350°F (175°C) for 18–22 minutes, or until the edges are just starting to bubble and the center looks set but still slightly jiggly. The top should look shiny and glossy, with the pecans lightly toasted.
Cool the pan completely on a wire rack at room temperature. This helps the layers settle so they cut cleanly later and don’t slide apart.
Once cooled, cover the glass casserole dish tightly with plastic wrap or a lid and refrigerate for at least 3 hours, or overnight. This is when the magic happens—the bars firm up into those classic icebox squares Grandma kept tucked away for after-dinner snackers.
When ready to serve, remove the pan from the fridge and let it sit on the counter for about 5–10 minutes to soften just slightly. Use a sharp knife to cut into 16 small squares (or more, if you want bite-sized snackers). Wipe the knife between cuts for the cleanest edges.
Store any leftovers covered in the same glass dish in the fridge for up to 5 days. They’re best enjoyed cold, one little square at a time, whenever someone wanders into the kitchen looking for a sweet bite.
Variations & Tips
To lean even more into the butter pecan flavor, brown the 3 tablespoons of butter for the topping before mixing it with the sweetened condensed milk; it adds a toasty, caramel note. For a slightly less sweet version, use a scant can of sweetened condensed milk (about 1 1/4 cups) and add a splash of heavy cream to loosen it. If you like a thicker, bakery-style bar, press the crust into an 8×11-inch glass dish instead of 9×13 and add 5–8 minutes to the bake time. Swap in half walnuts or almonds if you’re low on pecans, or use a mix for more texture. For a chocolate twist, sprinkle 1/2 cup mini chocolate chips over the hot bars right when they come out of the oven, then gently swirl them into the top without fully mixing for a marbled effect. To make these a little more weeknight-friendly, crush graham crackers in a zip-top bag with a rolling pin to cut down on dishes, and assemble the bars the night before; they slice even better on day two. If you need to transport them to a potluck or family dinner, keep them in the same glass casserole dish, chilled, and cut them on-site so they look neat and hold their shape.
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