"funnily enough" is correct and can be used in written English. It implies that something is surprising or unexpected. For example, "Funnily enough, my dog only likes broccoli when it's cooked.".
Funnily enough.
Funnily enough, he loves it.
Funnily enough, it's not.
[Laughs] Funnily enough, yes!
What to? Funnily enough, Redward.
Funnily enough, Bob Fletcher has.
Not McDonald's burgers, funnily enough.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia