Watching the donuts being made through the kitchen window at Glazed Over in Beacon is a mesmerizing experience. Owned by longtime Beacon residents Ron and Lisa Tompkins, the recently opened, family-run spot is the realization of an idea that came up during a vacation nearly 20 years ago. “We saw a little donut shop while we were at the shore and thought, ‘this is so great, this would be fun,’” says Lisa. “For years it was a running joke: ‘Someday we’ll open a donut shop.’ ”