Sorry I didn't see this earlier --hope you try this one too:
Yam & Pineapple Bake
3 large yams, baked, skinned & mashed (can do ahead, and refrigerate)
3/4 cup fresh pineapple, diced small (sub: tidbits, cut smaller, or crushed - do not drain!)
1/3 cup brown sugar
3-4 tablespoons butter, softened
Preheat oven to 350. Coat a 9x9 baking pan with cooking spray. Mix all ingredients together and spoon into dish. Bake 30-40 minutes until hot.
Vary the recipe by adding a little cinnamon, orange or lemon juice, or whatever you want!