To find the unit rate of muffins per cup of almonds, divide the total number of muffins by the total number of cups of almonds.
Manny makes 36 muffins and uses 4 cups of almonds:
\[ \text{Unit rate} = \frac{36 \text{ muffins}}{4 \text{ cups of almonds}} = 9 \text{ muffins per cup of almonds} \]
Thus, the unit rate is 9 muffins per cup of almonds.