Preheat the oven to 350°F (180°C). Line an 8-inch (20 cm) square pan with two pieces of overlapping parchment paper.
Add all of the ingredients to a large mixing bowl and mix until just combined, using electric beaters on low speed.
2 cups all-purpose flour, 1 cup vegan butter, ½ cup icing sugar
Bake for 30-35 minutes, or until lightly golden and fairly firm to the touch. Cool fully in the tin and slice into fingers once cool.
Alternatively, chill the dough for two hours and then roll it out to ½ inch thick. Cut into rounds and bake at 325°F (160°C) for about 13-15 minutes, or until lightly golden around the edges.
Notes
I find most vegan butter salty enough that you don't need to add salt to the dough.