Store them uncovered, at room temperature, for a cupcake texture.
If refrigerated, uncovered, they will have a fudge-like consistency.
Metric kitchen scales are an inexpensive yet invaluable gadget to enable accurate measurement of ingredients. Store them upright in a cupboard or over your worktop and they'll only take up a tiny bit of space. Click
HERE for the ones I use (UK Link). For U.S. option click
HERE.