Here are tips from someone who lives a mile above sea level!
Whats Different at High Altitudes?
Sometimes they even pop!
Simply Recipes / Lori Rice
An empty water bottle will collapse under the weight of the increased atmosphere as you get to sea level.
As you might imagine, this hidden variable can indeed affect cooking and baking recipes!
What Is High Altitude?
Simply Recipes / Sally Vargas
How Does Altitude Affect Recipes?
There are three major issues that can happen in your kitchen at higher altitudes.
Most recipes, even baking recipes, probably dont need adjustments.
Simply Recipes / Lori Rice
you might make the recipe unchanged and it will be edible and good.
Because water boils at a lower temperature, this can drastically affect cooking times on things like dried beans.
Otherwise, expect to add a lot of time onto the cook time for dried legumes and similar foods.
Simply Recipes / Eliezer Martinez
Tip
Altitude can affect pressure cooking times.
For those 2,000 feet and above, increase the cooking time by 5 percent for every 1,000 feet.
I hope those examples help.