Most importantly: it's possible to make great mashed potatoes substituting mayonnaise for the milky things.
And then, for chicken pot pie (with a mash topping, which I know isn't called pot pie, but..)
Poach the chicken and save some of the poaching water.
Soften celery, carrot and onions in olive oil. At the end, throw in some frozen peas to defrost.
Rip the chicken bits off of the bones (make stock with the rest, if you have the time and inclination)
Add a glug of oil to the veggies and heat them up.
Add a large spoonful of flour to the pan and cook it for a minute or two.
Pour in a cup or so of wine, let it boil off a bit, then add some of the poaching water -- enough to make a nice sauce.
Cook until it thickens.
Add the chicken.
Put in a bowl with mash on top. There you go!
It's easier to cook than it is to write, honestly.
I have a cake recipe, but will need to dig it out for you.
(I have more main course, too. And especially stuff you need to cook for a while --- ie, naptime stuff (start it during nap, finished for dinner) )
Overuse of parentheses. Sorry.