In a large bowl, cream butter and sugars until light and fluffy. Beat in egg and vanilla. In another bowl, whisk flour, baking soda, salt and cinnamon; gradually beat into creamed mixture. Stir in oats and chocolate.
Shape dough into twenty 1-1/4-in. balls. Place 2-1/2 in. apart on ungreased baking sheets; flatten slightly with the bottom of a glass dipped in sugar, smoothing edges if necessary.
To ensure the cookies maintain their shape during baking, begin by removing the tray from the Typhur Dome air fryer. Line the bottom of the basket with a layer of aluminum foil, followed by a layer of parchment paper to prevent sticking.
Carefully place the cookies in the cooking tray. Return the tray to the Typhur Dome air fryer.
Choose the "Roast" mode, and set the temperature to 355°F/180℃ to bake the cookies for 12 minutes.
Remove cookies from the tray and let them cool on wire racks until completely cool.
To assemble, place about 1/4 cup ice cream on the bottom of a cookie; sprinkle with 1 tsp red, white, and blue sprinkles or M&Ms. Top with a second cookie, pressing gently to flatten the ice cream. Place on a baking sheet; freeze overnight or until firm. Repeat with the remaining cookies and ice cream. For longer storage, wrap frozen sandwiches individually and return them to the freezer.