Brown Butter Snickerdoodle Cookie Skillet (or Cookies!)

Ingredients

• 1-2 Tbsp. softened butter (to grease the skillet)
• 1 cup unsalted butter (cut into 1 tbsp. pieces)
• 1 cup granulated sugar
• 3/4 cup dark brown sugar (packed)
• 1 large egg + 1 egg yolk (room temperature)
• 2 Tbsp. whole milk
• 1 Tbsp. vanilla extract
• 2 2/3 cups all-purpose flour (spooned and leveled )
• 2 tsp. cream of tartar
• 1 tsp. kosher salt (if using table salt, use ~1/4-1/2 tsp. )
• 1 tsp. baking soda
• 1 Tbsp. sugar
• 1/2 tsp. ground cinnamon
• Vanilla ice cream for serving (some would say optional, but I strongly encourage it 😉)