To adjust a recipe from 2 medium scoops of an ingredient to half, you'll need to halve the total amount called for in the original recipe. So if the original recipe calls for 1/4 cup when using the small scoop, and your original recipe used 3/8 cup (which is equivalent to 2 medium scoops), simply reduce that amount by half. Keep ingredient proportions consistent across all recipe components, including the liquid content, to avoid affecting the final texture. In this case, you can start by halving the butter, eggs, sugar, flour, etc., and adjust as needed for consistency.