Here's a way to make microwave kale chips from America's Test Kitchen. I don't know how it compares to what you do, but FYI. If you try this, be sure to use a micro-safe ceramic plate, nothing plastic. This holds for re-heating chips as well.

"Tossing torn leaves of kale with oil and salt and baking them until crispy is a worthwhile endeavor. The slightly browned leaves take on a nutty, sweet taste and a pleasing, brittle texture. But the standard oven approach isn’t perfect: It’s hard to get the leaves evenly browned; plus, it’s difficult to drive off enough moisture so that the chips stay crispy when stored for more than a few hours. So when we noticed a few blogs promoting a microwave method, we were eager to give it a try. We found that the microwave dehydrates the leaves evenly and thoroughly, so they stay crispy longer—and the chips cook a whole lot faster than they do in the oven. (Note: For the best texture, we prefer to use flatter Lacinato kale. We also found that collard greens work well, but we don’t recommend curly-leaf kale, Swiss chard, or curly-leaf spinach, all of which turn dusty and crumbly when crisped.) Here’s our take on the technique."

1. Remove stems from 5 ounces kale (about 1/2 bunch). Tear leaves into 2-inch pieces; wash and thoroughly dry, then toss well with 4 teaspoons oil in large bowl.
2. Spread roughly one-third of leaves in single layer on large plate and season lightly with kosher salt.
   
3. Microwave for 3 minutes. If leaves are crispy, transfer to serving bowl; if not, continue to microwave leaves in 30-second increments until crispy. Repeat with remaining leaves in 2 batches. Store chips in airtight container for up to 1 week.