I cook fulltime in my RV, but I also cook outside. I usually have my folding table near the electric outlet that is on the outside of the RV, so I often just put the crockpot out there to slow cook. You can bake things in a crockpot like potatoes, just scrub the skins, put in crockpot, (spray it or grease the crockpot with olive oil to save on cleaning) anyhow, put the whole potatoes in on low, about 4-8 hours later (depending on size) you have wonderful baked potatoes.
Another method to save on heating up the galley, is a good knife and a wok. Chop, slice, and dice. The smaller you chop and dice, the faster it will all cook in a wok and thus less heat.
In the summer, there are plenty of cold foods to make, salads, sandwiches and so on. You can cook the potatoes in the crockpot then chop them up for potato salad, when they have cooled.
Not having a microwave in your unit, is a pain in the tush. I use mine to steam veggies nearly every day. It also does pasta with less water and a lot less heat.
I use the exhaust fan over the stove, it has low and high, yes it's noisy on high, but it sure sucks the heat out. I also use the overhead AC fan on high fan without the AC running, to keep air moving around and all my windows are open. I only use AC as a last resort, since I love fresh air.
I want to know how to make my fan quieter, as John from Detroit said could be done. Tell us how John! Please.