Try lasagna using leek instead of pasta - the 'Hairy Bikers' did a recipe which was well liked by those who tried it.
pizza - there is 'fathead' pizza dough, useful for other things too.
I use cauliflower, roughly chopped, for a curry base, and I managed a low carb bread using alternatives to wheat flour, but these days I make sponge puddings - less time and effort and far more indulgent.
Before potatoes swede and turnip were food for humans as well as cattle, and mashed swede mixed with eggs makes a good bubble and squeak - aka bubble and squeal when served up with bacon. Mashed swede eggs and cheese baked in the oven is good - lots of cheese, soft cheese mixes in then grated cheese in layers and on top, with herbs or spices is lovely after a brisk winter walk.
I bought a 'fizz machine' recently - £30 rather than the £130 sodastream - and 6 bottles of sugar free pink grapefruit mixer and I am enjoying that in this hot weather.
Although 'healthy' carbs have been pushed for so long that we got used to them as an everyday staple, they have not been in our diet for very long looked at from an archaeological perspective. It has been noted that Humans are the only species clever enough to devise new foods but daft enough to eat them.