As I wrote in another comment[0]: Foreign parents, and most kids spoke like Oslo among other kids, and their dialect only with adults. So pretty plain Norwegian. Most people would however guess I'm from Østfold, due to a thick "L" I've no idea where I picked up high here in the mountains.
Thank you for correcting a pet peeve of mine: People thinking they "speak Bokmål". Everyone speaks a dialect.
That almost certainly means "a moderate Oslo dialect, neither Stovner or Frogner", and it's probably not nearly as close to written Bokmål as you think (unless you learned Norwegian as a second language).