The phrase "separate medium mixing bowl" means to use a different bowl that is not too big or too small for mixing ingredients separately from the main mixing bowl. Full definition
In separate medium mixing bowl, stir together coconut oil, pumpkin puree, sugars, and vanilla extract. (connoisseurusveg.com)
Remove 2 tablespoons of the dry ingredients and place in a separate medium mixing bowl. (e2bakesbrooklyn.com)
In a separate medium mixing bowl, combine the almond meal, hemp hearts, tapioca starch, sunflower seeds, baking powder, chia, psyllium, and pinch salt. (willfrolicforfood.com)