Q. What is the halacha with baking challah in a fleishig oven. Does the oven have to be cleaned before? not used within 24 hours? also when it is baked can it then be eaten with dairy?

A. Horav Shlomo Miller Shlit”a advices that if bread was baked in a clean fleishig oven – (i.e. the oven had no meat residue or spills), the bread is considered pareve and one may eat it with dairy, even if it was baked in an uncovered pareve pan and there was no 24 hour waiting period. However, one may not cook a food with liquid dairy product (e.g. lasagne with a lot of sauce) that is uncovered in a fleishig oven.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a