The phrase "ingredients mixture" refers to combining different things together to make a particular product or dish. It means blending or mixing various components or elements to create something. Full definition
With mixer on low, gradually add the dry ingredient mixture into the wet mixture and blend well until dough forms a ball and all ingredients are well mixed. (dailyforage-glutenfree.com)
Pour the wet ingredients mixture into the dry one, stirring until just combined. (ziziadventures.com)
Pour the dry ingredient mixture into a large bowl. (allourway.com)