You can pretty much substitute coffee with roasted grain coffee-like powder of any brand you like.
It works as a drop-in replacement in drinks and foods really well.
After all, coffee is just a roasted grain, too.
If you need instant coffee, one that dissolve in water or baked goods, I know for a fact that Inka brand makes instant roasted grain "coffee" that can be used as substitute.
I don't know about other brands quality, but you can try ones found on Amazon .
I personally prefer ones with sugar beet and chicory, some brands also use dandelion.
Additions are there to emulate coffee better, to make taste more rich and complicated.
Basically, if it tastes good and is bitterish enough, it'll work.
I'm not affiliated with linked sellers.
It is just an example.
cooking.stackexchange.com/users/36704/Mołot
If it's primarily a chocolate recipe the coffee is there to add flavour.
You may be able to simply omit it.
I would generally replace it with the same quantitity of (unsweetened) cocoa powder as otherwise the recipe may be a little too sweet.
If you find the overall recipe lacking in flavour after that, try more cocoa or adding a tiny bit of a compatible flavour, for a different but still good effect.
One thing that works well with chocolate is vanilla, another is ginger (though too much and it will dominate - good, but not what you asked for).
If the espresso powder is dissolved in liquid before adding, you can use liquid extracts to replace some of the liquid (but be careful what you buy if you also avoid alcohol as many who avoid coffee do).
This gives you slightly more choice, as you can use a little almond extract, or even mint, or replace the liquid with orange juice.
Of the flavours I mentioned, the almond and the vanilla would be best for just adding a subtle bit more flavour, while the others are conventionally used with chocolate in some recipes and ould go well, though change the end result.
If the recipe is a mocha recipe, or there's a lot of coffee in there, I suggest looking for a similar recipe with no or less coffee.
This is always an option.
cooking.stackexchange.com/users/20413/Chris H
It won't be coffee flavored (maybe that's not a bad thing), but what about ground black cardamom?
I have yet to try it (I am ordering it shortly), but Alton Brown has updated some of his old recipes.
His updated chocolate syrup uses black cardamom to enhance the coffee syrup.
From his description in the episode, it sounds like more of an herbal compliment, unlike espresso powder's enhancement of the bitter flavors.
See new recipe here .
I fully plan on playing around with black cardamom and chocolate.
cooking.stackexchange.com/users/71408/Van
Chaga mushroom powder has a similar flavor profile to a lot of coffees and is also super good for you.
Coffee is a roasted cherry pit, not a grain, so I'd avoid those.
There are a lot of acidic and tannic qualities in brewed coffee, so even a black tea powder may work well!
Like another poster said, it's really just to add depth of flavor to the chocolate.
cooking.stackexchange.com/users/72015/Evan Taylor
Barley Cup was the go-to instant coffee substitute back in the day - roasted cereal and chicory in an easy-to-use powder.
cooking.stackexchange.com/users/72025/Jonathan Moore
Artificial coffee flavour seems like the right solution for your problem.
cooking.stackexchange.com/users/18235/Enivid
I see Espresso Powder frequently in chocolate-based baking recipes. I've done some searching here (and elsewhere online) for potential substitutes, but have only been able to find other coffee-based substitutions.  For  religious reasons  I would like to avoid coffee products. To clarify - caffeine is not the issue, but rather the coffee bean itself.  What are some effective substitutes for espresso powder in chocolate-based baking recipes (e.g. brownies) that do not contain the coffee bean?
Please suggest a substitute for espresso powder which is not made from coffee
cooking.stackexchange.com
<baking><substitutions><chocolate><espresso>
cooking.stackexchange.com/questions/94776
cooking.stackexchange.com/users/63060/Dacromir
You can substitute coffee with different kinds of roasted grain powders such as Barley Cup or artificial coffee flavour, omit it and add more cocoa powder or use a different flavour like ground black cardamom or Chaga mushroom powder. Coffee is not a grain but it is often replaced by roasted grains in cooking. Other options to be considered are black cardamom, black tea, chaga mushroom powder and artificial coffee flavour. In some recipes, on the other hand, it may be possible to omit it altogether and replace with extra cocoa.
Roasted grains are considered a good substitute for expresson powder. However, coffee is not a grain so the taste may not be similar. Expresso powder can be omitted in most recipes or additional cocoa can be added in chocolate recipes. Other alternatives to coffee powder include black cardamom, chaga mushroom powder, black tea and artifical coffee flavouring.