Rhubarb Cake with Butter Sauce

Ingredients:
For the cake:
1 1/2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon salt
1 cup granulated sugar
1/2 cup unsalted butter, softened
1 egg
1 teaspoon vanilla extract
1/2 cup milk
2 cups chopped rhubarb
For the butter sauce:
1/2 cup unsalted butter
1 cup granulated sugar
1/2 cup heavy cream
1 teaspoon vanilla extract
Directions:

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