This was simple and we loved it:
1-2 tablespoons butter/margarine
1 teaspoon lemon juice
Crushed Corn Chex
Melt the butter and add in the lemon. Brush the lemon butter on the fish and then sprinkle with the Chex. We will make this again and we'll use more Chex. I was so uncertain how the Chex would taste on the fish that I used a small amount. My daughter told me we should double it next time.