Someone gave me a six pack of Habenero beer -any suggestions for cooking with it? It won't be drunk!

Also, drink them michelada style with some Clamato in a salt or Tajín rimmed glass. https://en.wikipedia.org/wiki/Taj%C3%ADn_(seasoning)
The Clamato will tamp down the heat of the beer.

Frijoles Borachos! It would be fabulous in there. Beans, onions, tomatoes,garlic, beef, bacon and beer. The recipes usually call for just a cup of beer but I use the whole bottle. I usually add jalapeños so your beer would fit in perfectly. Love these beans!

Beer quick bread (with baking powder).
Many recipes out there...see Genius Kitchen for a start.

I also support using it it in chili, and other types of stews. You could use it in curry - I've made a red curry dish that called for cooking chicken in beer and coconut milk and it's really good. Unfortunately I can't find the recipe I used :(

I like to marinade a wild boar roast in beer with honey and rosemary. I'm sure it would work with beef, venison, or pork as well.

How about using in a marinade for chicken or shrimp, like tequila chicken?

It might also be good in a seafood boil.

Years ago, my sister made "Mexican" rice with a little beer and seasonings. Might want to add it to rice for flavoring.

I'd try using it as a moistening liquid in a braise, like pulled pork. Since there are many, many kinds of braises, you have plenty of options there.

Another alternative is using in for beer can chicken, the kind you roast over a beer can.

Maybe you can use some of the beer in a glaze or sauce, especially something that is cooked down and reduced like a BBQ sauce.

Or maybe you can see if it'll trap insects in your garden. Not sure how strong the habanero scent is and if it is offputting enough for bugs.

You might try a take on carbonnade Flammande: https://www.saveur.com/article/Recipes/Classic-Beef-Beer-Stew
but switching to some South-of-the-border seasonings such as juice of an orange in place of the vinegar, cinnamon, etc. I would take a small swig if you can, to determine the amt. of dried chiles to add (or not):
https://www.saveur.com/lamb-adobo

Seconding using it in chili. You could also use it to make bread -https://food52.com/recipes/12002-garlic-parmesan-and-herb-beer-bread. You could also try a Beer & Cheese soup -https://food52.com/recipes/74220-vermont-cheddar-cheese-and-beer-soup

I often add a bottle of beer to my chili recipe. That might work.