My now favorite white cake recipe

Ingredients

• 1 (18.25 ounce) package white cake mix
• 1 cup all-purpose flour
• 1 cup white sugar
• 3/4 teaspoon salt
• 1 1/3 cups water
• 1 cup sour cream
• 2 tablespoons vegetable oil
• 1 teaspoon almond extract
• 1 teaspoon vanilla extract
• 4 egg whites