Easy Peanut Butter Cookies

Ingredients

• ½ cup unsalted butter, at room temperature
• ½ cup packed light brown sugar
• ¼ cup sugar
• ½ cup creamy or crunchy peanut butter
• 1 egg, room temperature
• 1 tsp vanilla extract
• 1 ¼ cups all-purpose flour
• 2 tbsp cornstarch
• ½ tsp baking soda
• ½ tsp salt