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In a large mixing bowl, whisk together flour, baking soda, baking powder and salt.
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In a large mixing bowl, mix together butter and sugar. Beat until light and fluffy, about 2 minutes.
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Add egg and vanilla and mix well.
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Add the dry ingredients all at once and mix for 5 seconds.
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Add funfetti and mix the dough until the flour is incorporated. Do not overmix.
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Chill the dough in the fridge for at least 2 hour, preferably overnight.
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Preheat oven to 375 degrees F.
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Spray a mini muffin pan with a baking spray.
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Scoop the cookie dough with a small cookie scoop right into the cups of your muffin pan.
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Bake cookies for 8 to 10 minutes ( 9 minutes was the magic number for me).
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Cool for 5 minutes on the sheet. Transfer onto a wire rack to cool completely.