Which mixing method for cookies adds all ingredients to the bowl at once?

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In this question the technique being tested is how ingredients are combined when making cookie dough. The one-stage method blends all ingredients in the mixing bowl at once and mixes until just combined. There’s no separate step to cream fat with sugar or to mix dry and wet ingredients separately, so the dough comes together quickly with minimal aeration.

This approach contrasts with other methods: the creaming method starts with fat and sugar beaten together to trap air for a lighter crumb, the muffin method mixes dry and wet ingredients separately and combines them just until moistened, and the biscuit method cuts fat into dry ingredients before adding liquids to create a flaky, layered texture. Because all ingredients are added together at once, the one-stage method is the straightforward, single-bowl approach appropriate for many drop cookies.