I am sorry that your muffins were still soggy in the center. I am glad though you thought they tasted good. And a powdered sugar glaze would be delicious.
A couple of thoughts:Is there a reason you couldn’t bake past 22 minutes? it does say until the toothpick comes out clean. Also is your oven calibrated to 375 degrees, I don’t know if you have tested it recently with an oven thermometer? I discovered recently that our kitchen oven was often by almost 15 degrees. So I adjust temperature accordingly.
But thanks for letting us know. Hope you enjoy another recipes we offer.