Preheat to oven to 350 degrees F.
Line a 9x13 pan with parchment paper or grease well.
In a small bowl combine flour, cinnamon, baking soda and salt. Stir to distribute and set aside.
2 1/2 cups einkorn all purpose flour, 1/2 tsp cinnamon, 1 1/2 tsp baking soda, 1/2 tsp salt
In a large bowl combine butter and sugar. Whisk or beat with a hand mixer.
1/2 cup butter, 1 cup sucanat sugar
Add in vanilla and applesauce and beat until emulsified.
2 tsp vanilla extract, 1/2 cup applesauce
Str into the flour mixture until fully incorporated. Mixture should be thick but if too thick, add 1-2 tbsp of milk.
1 1/3 cup dark chocolate chunks
Fold in dark chocolate chunks.
Fold into a prepared pan and spread in an even layer. As the batter is very think, it may be more simple to drop it in dollops and then smooth it. Optional: Sprinkle with flaky sea salt.
Bake for 21-25 minutes until golden brown and puffy.
Remove from oven and cool for 30 minutes. Cut into 24 pieces.