About the only real concession to "high altitude" cooking is the time it takes to boil water and cook meals that use fluids. It just takes a little longer but it is certainly not impossible or even very hard. We have tent camped, truck camped and FW camped for about 50 years and have not found it very hard to make meals out of anything we choose. Just take your time and don't hurry and you'll be fine. You will probably have more problems hiking at "high" altitude than you will cooking, the air is a bit thinner at altitude so the lungs have to work a bit harder when you hike.