Mushy brown rice can be hard to fix, but here are a few tips.   Try draining the rice in a colander. After excess water drips out, return it to the pan, cover with a lid, and set OFF HEAT to continue to cook and dry out in the warm pan.   If the rice is too mushy to be eaten on its own, add the mushy rice to a recipe. When mixed in a casserole or in brown rice pudding, the mushiness may not be so noticeable.