1-First Step: Preheat and Prep Preheat oven to 350°F. Line two baking sheets with parchment paper. This prevents sticking and ensures even baking for golden edges on your oatmeal cookies.

2-Second Step: Cream the Wet Ingredients In a large bowl or stand mixer, beat 1 cup softened butter, 1 cup brown sugar, and 1/2 cup granulated sugar on medium speed for 2-3 minutes until light and fluffy. Add 2 eggs one at a time, beating well after each, then mix in 1 tsp vanilla. For vegan, use flax eggs here.

3-Third Step: Combine Dry Ingredients In a separate bowl, whisk 1.5 cups flour, 1 tsp baking soda, and 1 tsp cinnamon. Gradually add to wet mixture on low speed until just combined. Stir in 3 cups rolled oats by hand for even distribution and chewiness. For gluten-free, swap flour now.

4-Fourth Step: Scoop and Bake Cookies Drop tablespoon-sized dough balls (about 1.5 inches apart) onto prepared sheets. Bake 10-12 minutes until edges are firm but centers soft. Cool on sheets 5 minutes, then transfer to wire rack. Repeat for all dough; yields 48 cookies. Underbake slightly for extra softness.

5-Fifth Step: Make the Cream Filling Beat 1/2 cup softened butter 2 minutes until pale. Add 1 cup marshmallow fluff, 2 cups sifted powdered sugar, 1 tsp vanilla, and pinch salt. Mix low then high 3-4 minutes to fluffy peaks. Add 1-2 tsp milk if thick. Chill 30 minutes for easy spreading. Low-cal tip: Use half fluff, add yogurt.

6-Sixth Step: Assemble the Pies Flip cooled cookies flat-side up. Spread or pipe 2 tbsp filling on half, top with matching cookie. Press gently. Makes 24 oatmeal cream pies. For variations, add cocoa to filling midway.

7-Final Step: Serve and Enjoy Let assembled pies set 30 minutes. Serve at room temp for best texture. Pair with milk or iced tea from our refreshing recipes collection. Store as detailed below.