Lettie's Lightning Cake with Strawberry Jam

Ingredients

• Soft butter for greasing the pan
• 1/3 cup milk
• 6 tablespoons unsalted butter
• 3 eggs, room temperature
• 1 1/3 cups sugar
• 1 2/3 cups all-purpose flour
• 1 ½ teaspoons baking powder
• ¼ teaspoon salt
• 1 teaspoon vanilla extract Confectioners’ sugar