Step 1: Preheat oven to 350°F (175°C) and grease a 9×13-inch baking pan.
Step 2: In a large bowl, whisk together flour, sugar, baking powder, and salt.
Step 3: Add softened butter, milk, eggs, and 2 teaspoons vanilla extract to the dry ingredients.
Step 4: Beat with an electric mixer on medium speed for 2 minutes until smooth and well combined.
Step 5: Pour batter into prepared pan and spread evenly.
Step 6: Bake for 25-30 minutes until a toothpick inserted in center comes out clean.
Step 7: Let cake cool completely in pan on a wire rack.
Step 8: For frosting, beat heavy cream, powdered sugar, and 1 teaspoon vanilla extract until stiff peaks form.
Step 9: Spread whipped cream frosting evenly over cooled cake.
Step 10: Slice and serve immediately, or refrigerate until ready to serve.