1/2 cup unsalted butter, cubed 
1/2 cup sugar 
1/2 cup packed brown sugar 
1 large egg, room temperature 
1 tablespoon vanilla extract 
1-1/2 cups all-purpose flour 
1/2 teaspoon sea salt 
1/2 teaspoon baking soda 
1 cup brickle toffee bits 
1/2 cup Nutella 
Confectioners' sugar, optional
1. In a small heavy saucepan, melt butter over medium heat until golden brown, 5-7 minutes, stirring constantly. Remove from heat. Transfer to a large bowl. Cool completely until butter is solid. 
2. Preheat air fryer to 350°. Line bottom of a greased 8-in. round baking pan that will fit in air fryer; grease paper. Add sugars to butter; beat until crumbly, about 2 minutes. Beat in egg and vanilla. In another bowl, whisk flour, salt and baking soda; gradually beat into butter mixture. Fold in toffee bits. 
3. Press half the dough onto bottom and up sides of prepared pan. Spread Nutella over dough in pan to within 1/2 in. of edge. Press remaining dough between sheets of parchment into an 8-in. circle. Place over Nutella; pinch edge to seal. If desired, sprinkle with additional sea salt. 
4. Cook until a toothpick inserted in center comes out clean, 10 to 12 minutes. Loosen side from pan with a knife. Cool in pan 10 minutes before removing to wire rack; remove paper. If desired, dust with confectioners' sugar before serving.
Prize Winning Recipe
TOTAL TIME: Prep: 15 min. + cooling Cook: 10 min. 
YIELD: 12 servings. 
Nutrition Facts
1 piece: 369 calories, 18g fat (8g saturated fat), 43mg cholesterol, 261mg sodium, 49g carbohydrate (36g sugars, 1g fiber), 3g protein.