Easter Sheet Pan Cookies (One Bowl!)

Ingredients

• 1 cup unsalted butter, melted and slightly cooled
• 1 1/2 cups dark brown sugar, packed
• 1 cup granulated sugar
• 2 large eggs, room temperature
• 2 large egg yolks, room temperature
• 2 Tbsp. whole milk
• 1 1/2 Tbsp. pure vanilla extract
• 3 1/2 cups all-purpose flour, spooned and leveled
• 2 tsp. cornstarch
• 1 tsp. baking soda
• 1 tsp. baking powder
• 1 1/2 tsp. kosher salt
• 9 oz. bag Cadbury eggs, chopped
• 3/4 cup chocolate chips
• garnish with more crushed Cadbury eggs, chocolate chips, and flaky sea salt