01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - Combine ground flaxseed and water in a small bowl. Stir and let sit for 5 minutes until thickened.
03 - Whisk together melted coconut oil, brown sugar, and granulated sugar in a large bowl until smooth. Add flaxseed mixture, non-dairy milk, and vanilla extract. Mix until well combined.
04 - In a separate bowl, whisk together flour, baking soda, baking powder, and salt.
05 - Gradually add dry ingredients to wet ingredients, mixing until just combined. Fold in vegan chocolate chips.
06 - Scoop approximately 2 tablespoons of dough and flatten in palm. Place 1 teaspoon chilled Biscoff spread in center, then wrap dough around it, sealing edges. Repeat with remaining dough and Biscoff.
07 - Place stuffed cookie dough balls on prepared baking sheet, leaving space between each.
08 - Bake for 11-13 minutes, until edges are golden but centers remain soft.
09 - Let cookies cool on baking sheet for 5 minutes, then transfer to wire rack to cool completely.