Tiffani Amber Thiessen’s face is burned into the brains of every elder Millennial who watched countless Saved by the Bell episodes and dreamed of dressing exactly like Kelly Kapowski. Of course, we’ve all left the 1900s behind and have grown into adults — parents and women with careers. And so has Thiessen. Like the rest of us, the 52-year-old mom of two kids — Harper, 16, and Holt, 11 — has left high school in the rear view mirror, but her career continues to flourish. And she’s still in the classroom, in a way: Coven Academy, the witchy dark academia series in which she stars as the principa...