Put in a large bowl:

1/2 cup (1stick) melted butter
2 eggs
1/2 cup brown sugar
3 cups oatmeal
2 teaspoons baking powder
1 teaspoon salt

Make a well in the center and add:

1 cup milk
1 teaspoon ground cinnamon
1 t4easpoon vanilla extract
1/2 cup raisins or dried cranberries
1/2 cup coconut (optional)
1/2 cup walnuts (optional)

Blend well. Pour into greased 9x13 inch pan.