Preheat oven to 325°F (160°C) and spray an 8" square pan with nonstick spray.
Mix flour, cinnamon, baking soda, and salt. In another bowl, whisk melted butter, milk, egg white, and vanilla. Stir in honey and stevia. Combine with dry ingredients.
Press dough into pan evenly. Bake for 10-12 minutes until firm. Cool completely.
Prepare frosting by beating yogurt, cream cheese, pudding mix, cinnamon, and stevia for 2 minutes. Chill for 2 hours.
Spread frosting over cooled bars and slice into 16 squares.
Notes
Chill the frosting for best results and use an offset spatula for spreading.