Program your oven to 350°F.
Whisk the almond flour, brown sugar, and sea salt in a small bowl, then stir in the melted butter and almond extract until it is combined. Stir in the almonds and useyour fingers to rub the butter into the almond flour until it resembles crumbs.
Spread the almond brown sugar crumble onto a parchment-lined baking sheet and bake it for 10 minutes. Stir the crumble and bake it another 5-10 minutes until the almond brown sugar crumble is evenly browned.
Cream the softened butter, brown sugar, and granulated sugar in the bowl of a stand mixer for 2-3 minutes until it's light and fluffy. Next, add the large eggs one at a time, then stir in the vanilla extract and beat until it is incorporated.
Whisk the all-purpose flour, baking soda, cinnamon, nutmeg, salt, and nutmeg in a bowl, then add it 1cup at a time to the butter eggs mixture. Fold in the oats and raisins just until combined.
Drop rounded tablespoons of the oatmeal cookie batter onto a parchment-lined and bake for 10-12 minutes until the edges are lightly golden.
Let the oatmeal cookies cool for 2 minutes on the cookie sheet, then place them onto a wire rack to cool completely.
To assemble the oatmeal cookie ice cream sandwiches, spread the softened vanilla ice cream onto the bottom of one oatmeal cookie. Place the second oatmeal cookie on top and roll it into the almond brown sugar crumble cookie.
Wrap the cookies withplastic wrap and place them into an airtight container, and freeze them for 1-2 hours until they are firm.