To keep your mocha espresso brownie bites fresh, store them in an airtight container at room temperature for up to 3 days. For longer storage, you can refrigerate them for up to a week or freeze them for up to 3 months. Just make sure to wrap them tightly in plastic wrap or aluminum foil before freezing.

Yes, you can easily make these brownie bites gluten-free by substituting the all-purpose flour with a 1:1 gluten-free flour blend. This will maintain the texture and flavor while accommodating those with gluten sensitivities.

If you don't have espresso on hand, you can substitute it with strong brewed coffee. Alternatively, you can use instant coffee granules dissolved in hot water for a similar flavor. Just ensure that the coffee is strong enough to infuse the brownie bites with that rich mocha taste.

Mocha espresso brownie bites pair wonderfully with a scoop of vanilla ice cream or a dollop of whipped cream. For a beverage pairing, consider serving them with a rich cup of coffee or a glass of milk to complement the chocolate and espresso flavors.

To ensure your mocha espresso brownie bites are perfectly baked, keep an eye on them during the last few minutes of baking. Insert a toothpick into the center; they are done when it comes out with a few moist crumbs. Avoid overbaking, as this can lead to dry brownie bites.