If you have a recipe that calls for cooked chicken breasts

Throw them in a pot, cover with water, cook on the stove for about 30 minutes. You can add seasonings or veggies if you like for added flavor ... a slice of onion, a bay leaf, whatever. Then strain the cooking water and use it to cook rice or noodles (if you like ... not required).

Or you can put them in a microwave-safe dish with a little water, cover and cook in microwave till cooked through. Not sure how long it takes because I always do it on the stovetop.

Or when you grill or sauté chicken breasts for dinner, cook some extra to save for a recipe later in the week, or store in freezer.

Or roast a whole chicken or buy a rotisserie chicken, and pull all the meat off. Eat some fresh, cook with the rest.

I would grill them or cook them in the crock pot, depending on the season and purpose. Chicken in the crock pot shreds nicely.

I usually cook the chicken in the crockpot 

My mom does them in the microwave (being even kitchen-lazier than I am), which is the only reason I know about microwaving them.

but ohhhhh! I forgot about the crockpot! Good method for those who think ahead.

microwave..still in glass pan, cover with wax paper..cook 3 minutes one side, flip, cook 2 minutes or so other side. or I poach in water in fry pan on stove..15 min...all done.

I usually poach them on the stovetop with some herbs like ntsf and mom2jnk mentioned above. Also, when I'm cooking diced chicken for a recipe, I season it with salt/pepper only, then cook and freeze half of it, then use the other half for my recipe so there's always an extra bag of chopped cooked chicken to add to soups, casseroles, stirfry, etc.

This is what I do.

I boil mine on the stove most of the time. My friend told me to add a little baking soda to the water for extra tenderness. Baking soda will cause the water to boil over if not watched carefully but it does make tender chicken.

I just bake them on a foil lined pan for easy clean-up and because they seem to come out more tender that way. Sprinkle a little seasoning on them, bake 'em for 20 minutes or so and done.

LL

Grill or bake them depending on the dish and how warm it is.

I either use a rotisserie chicken or I sauté the chicken in a skillet.

I usually cook them ahead of time in the crock pot. I've also chopped them up and thrown them in the skillet with a little olive oil and chopped onion and sauteed them. You just cook them until they are white and they cook up surprisingly fast.

I will grill or bake them. Quite often I bake a several boneless skinless breasts and freeze them so I have them on hand for any recipes or a quick dinner.