I don't know much about cooking, but am learning more since going paleo. In the interests of saving time, what are the most efficient methods of cooking?

The 4 things I'm looking for are: 1) Health 2) Time and Ease 3) Low Cost 4) Acceptable taste

Heres my thoughts on the cooking methods I know of, are there any ways I can improve to become more efficient or healthier? Where am I mistaken?

1) Pressure cooker: -Seems like the best, chop up your food, put it in the cooker with some water, and set a timer at the appropriate time. -Could easily cook up most of your days food with little time and effort -Cleanup is easy

But is cooking meat with a pressure cooker healthy? If I pressure cook something can I just toss a bone in there, will the beneficial nutrients in the bone soak into the other food? I don't really eat the broth, not sure how.

2) Baking -Easy and doesn't require much attention -More attention than pressure cooking, need to check or flip things sometimes -cleanup seems to be harder due to things sticking in the pans, potentially spilling in oven -Aluminum foil to line pans is an extra cost

3) Stir Fry -Needs a lot of attention with the stirring and checking if its cooking evenly and whatnot -Tough to do a lot of food at once -Cleanup can be a pain with things sticking to the pan