Baking Turnips But are coming out burnt or soggy

I have tried baking turnips but they turn out very soggy or burnt. Any ideas? Below is the recipe I was using.

Oven 350 Turnips - thinly sliced Olive oil Rosemary

I baked the slices on a baking sheet with the olive oil and rosemary brushed on both sides for about 30-45 minutes.