Mix flour, baking powder, sugar, melted butter, and milk.
Fold in cranberries.
Pour into greased 8 x 8 pan.
Bake at 350 degrees for 40 minutes.
SAUCE:
Mix above sauce ingredients and microwave until smooth.
Mix 1 teaspoon or so of cornstarch into a small amount of water.
Add to other mixture.
Heat in microwave to boiling.
Add 3 tablespoons lemon juice and microwave for one more minute.
Spoon warm sauce onto cake.