At one mile high I have not had any issues with my recipes as far as baking goes. Boiling is a different matter and does require longer times. You are much higher than I am.@R2elk I know you bake a lot of family favorites, but I came across a high altitude baking webpage yesterday and thought I'd share the link in case you want to check it out:
highaltitudebakes.com
Someone has asked me to bake them a red velvet cake so I'm going to try her recipe this weekend. (Might make more of the frosting though to cover the top.)
red-velvet-stack
The cookbook that I gave you has my maternal grandmother's Red Velvet Cake recipe in it. She would frost hers with a marshmallow frosting but a cream cheese frosting is also excellent.