Why did mine fail?
Pick the symptom. Each answer comes straight from the converter rule base — and filing testimony about your bake is what sharpens the next answer.
Gummy texture Fell apart / crumbly Dense / heavy Dry Sank in the middle Bland Spread too much Gritty
Spread too much
Chill. Gum-free cookie dough goes into the oven cold — scoop, chill at least an hour (overnight is fine), bake from cold. Also confirm the flour weight: an under-floured cup spreads.
Run your recipe through the converter — it applies these rules automatically.