Preheat the oven to 350°F (177°C) and line a baking sheet with parchment paper or a silpat
In a small bowl, whisk the ground flax seed and water until it turns into a sticky paste. Let sit
Toast the oats in the oven for 5 to 8 minutes, or until they’re golden brown. Watch them carefully so they don’t burn. Remove from oven and let cool.
In a medium bowl, whisk the flour, baking powder, baking soda, cinnamon, and salt until well combined. Set aside.
In a large mixing bowl, beat the butter, sugar, maple syrup, flax egg, and vanilla on a high speed until smooth and creamy, approximately 2 minutes. Add the flour mixture and blend on a low speed until combined. The cookie dough should look smooth and creamy. Add the oats and beat until just blended.
Stir in the raisins until evenly combined. Scoop out heaping tablespoons (15 g) and roll into balls. Slightly press the balls down on the cookie sheet and bake for 12 to 15 minutes, or until the cookies are firm and golden brown on top. Cool on a wire rack.