Preheat the oven 350°F (175°C)

Sift the flour, salt, baking soda, cinnamon powder. Set aside.

Put butter, brown sugar, and granulated sugar in a mixing bowl. Using hand mixer, mix until fluffy and light.

Add in egg and vanilla extract, keep mixing with medium speed for 2-3min.

Lower the speed, then add flour mix, mix until no more flour appears. Add in the oats, continue mixing until just combined.

Add in raisins and chopped walnut. Fold until well mixed.

Scoop the cookie dough about 1 tablespoon and put on baking tray. Bake about 10minutes or until brown.

Remove the cookies from baking tray, and let cool on wire rack.