Halloumi and sweet potato tacos

I came up with this idiosyncratic recipe during the years that Oscar, our oldest son, was a pescatarian. It's so good that it remains a weeknight staple, even though Oscar eats meat again. Most of the prep can be completed while the water is coming to boil and the oven is heating. I like to serve it with a simple coleslaw, which I often have pre-made in the fridge, and store-bought Mexican salsa verde.