hi.i used to make a delicious 'cherry crumble' which had

*1c oats (rolled)
*1 c. flour,
*1/2 cup butter,(!)
*1 cup sugar
*pinch salt

1/2 of mix 'patted' on bottem of 9x13 pan..
filled with 4 c cherries,tapioca flour,almond extract

with rest of crumb mixture patted on top and baked in a 350 degree oven for 45 minutes.

mmmm.
but now am on a more fat-restricted/sugar restricted diet.

i am not good at substituting.

can i get the same result with half the butter and half (or more) the sugar!

any other recipes for cherry crumble or cherry crunch would be appreciated.
thanks
alice