Heat oven to 350F and line 2 cookie sheets with paper.Melt butter in a big pan on medium. With a rubber spatula, stir butter until amber and milk deposits separate and brown. Remove heat rapidly. Cool 15 minutes.
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Before usage, butter must be room temperature. If even slightly heated, the cookies will spread more in the oven and have a softer dough consistency. The butter will quickly cool if placed in the freezer for 10 minutes after 15 minutes.
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Sift flour, baking soda, baking powder, salt, cream of tartar, and cornstarch in a medium basin. Set aside.Mix sugar and browned butter in a large bowl. Mix in eggs and vanilla. Mix well. Mix in dry ingredients.
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In a small dish, blend sugar and cinnamon. Take a 3 oz cookie scoop and scoop big cookie dough balls. Roll balls in cinnamon-sugar. Use 6 cookie dough balls per sheet.
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Bake cookies one pan at a time for 12-14 minutes. When edges are slightly golden brown, cookies are done. Let sit on cookie sheet for 5 minutes before transferring.
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