Spring M&M Cookies

Ingredients

• 1 ½ cups all purpose flour (spooned and leveled)
• ½ tsp. cornstarch
• ½ tsp. baking powder
• ½ tsp. baking soda
• ½ tsp. salt
• ½ cup unsalted butter (softened)
• ½ cup light brown sugar
• ½ cup granulated sugar
• 1 large egg (room temperature)
• 1 tsp. vanilla extract
• ½ cup pastel M&Ms (plus more for garnish)
• ½ cup semi sweet chocolate chips (plus more for garnish)
• flaky sea salt (for garnish (optional))