Answer would be zero (0) servings
Step by step
3/8 cookie is smaller or less than 1/2 cookie
To prove this, we need to change 1/2 cookie to same denominator of the 3/8 cookie
1/2 = multiply top and bottom by 4
1/2 = 4/8
4/8 is a serving, you only have 3/8 of a cookie which is smaller so you have 0 servings