To find out how much flour is used in the body of the dessert, we need to subtract the amount of flour used for the crumble from the total amount of flour required for the recipe.
The total amount of flour required is \( \frac{3}{4} \) cups. The amount of flour needed for the crumble is \( \frac{1}{4} \) cups.
Now, we need to perform the subtraction:
\[ \frac{3}{4} - \frac{1}{4} = \frac{3 - 1}{4} = \frac{2}{4} \]
Next, we simplify \( \frac{2}{4} \):
\[ \frac{2}{4} = \frac{1}{2} \]
Thus, the amount of flour used in the body of the dessert is \( \frac{1}{2} \) cups.