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Preheat oven to 350°F. Line two baking sheets with parchment paper or silicone baking mats.
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In a big mixing bowl, cream collectively 1 cup salted butter, 3/4 cup mild brown sugar, and 1/2 cup granulated sugar utilizing a hand mixer or stand mixer till mild and fluffy.
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Beat in 2 massive eggs and 2 teaspoons vanilla extract till simply mixed, about 30 seconds.
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Add in 2 cups all-purpose flour, 2 teaspoons floor cinnamon (if utilizing), 1 teaspoon baking powder, 1 teaspoon baking soda, and 1/2 teaspoon salt. Combine till mixed.
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Stir in 2 cups fast oats till nicely mixed.
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Scoop dough into 2 inch balls and place onto the ready baking sheets. Sprinkle with a kiss of sugar if desired. There must be 12 cookie dough balls per pan.
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Bake within the 350°F oven till the tops are golden brown, about 10-12 minutes.
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Let cool on the baking sheets for quarter-hour earlier than serving heat, or switch to a wire rack to chill utterly.
Cream Filling:
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In a big mixing bowl, use a hand mixer to beat 1/2 cup salted butter till mild and fluffy, about 2-3 minutes.
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Beat in 1 teaspoon vanilla extract till mixed and clean.
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Beat in 2 cups powdered sugar, a half cup at a time, mixing in between additions till clean. After including within the first 1 cup, add in 2 teaspoons milk and whip till clean earlier than including within the closing 1/2 cup of powdered sugar.
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Stir in 2 cups marshmallow cream till nicely mixed.
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Pipe or unfold the cream filling onto the cooled oatmeal cookies and luxuriate in!
Serving: 1massive cookie | Energy: 687kcal | Carbohydrates: 102g | Protein: 6g | Fats: 30g | Saturated Fats: 18g | Polyunsaturated Fats: 2g | Monounsaturated Fats: 8g | Trans Fats: 1g | Ldl cholesterol: 111mg | Sodium: 466mg | Potassium: 174mg | Fiber: 2g | Sugar: 66g | Vitamin A: 908IU | Vitamin C: 0.01mg | Calcium: 62mg | Iron: 2mg