Do with apple peel

The only trick I know of is to use a different variety of apple-- some will turn to complete mush, while others stay firm. Unfortunately, unlike potatoes, they don't tend to be marked at the super market as to which variety they are.

Now, I'm not familiar with Bramley, but from what I've found, it's compared to Granny Smith, which tends to hold up well in pies.

I'd recommend blind baking your crust, if you aren't already, so the filling isn't in there as long, and possibly going with a thicker slice of apple when you're cooking, in hopes they won't break down as quickly.

update : in checking CookWise, there's a comment in the apple pie recipe that "briefly sautéing and poaching apples softens them slighly before the sugar, which prevents cells falling apart and preserves texture, is added"

My parents have a Boskoop tree in their garden. I would probably peel the apples before baking them into a pie, but it wouldn't be impossible to not peel them.

The skin is thicker than most red/yellow apples but not as hard as a Granny Smith's, say. When I lived in the Netherlands, if I bought Boskoop (or Goudreinette, as they're commonly called there) in the store, the skin would be a little thinner than from my parents' tree (maybe because the conditions are not as carefully controlled as with professional growers?), but the statement above still holds.

^{Boskoop apples are one of the foods I miss from home, living in Canada now. Sniff.}