CAN I USE DARK CHOCOLATE CHIPS INSTEAD OF SEMI-SWEET CHOCOLATE CHIPS?Sure, but between the dark chocolate and the espresso they might end up a little bitter. On the flip side, if you have a sweet tooth, you might want to try these with milk chocolate chips!
CAN I USE WHOLE-WHEAT FLOUR?Yes! That type of flour does absorb more moisture so you'll want to add an extra splash of milk or a little extra butter so they cookies don't end up dry and crumbly.
CAN I USE INSTANT COFFEE POWDER INSTEAD OF ESPRESSO POWDER?Yes, but it will taste a little bit different. Espresso powder is usually more intense and concentrated.