Heat oven to 350°F (175°C). Line 8×8 inch pan with parchment.
Mix melted vegan butter, sugar, and salt. Add flour, stir into thick dough, press into pan, bake 16–18 min until edges are lightly golden.
In saucepan, whisk lemon juice, zest, sugar, coconut milk, cornstarch, and turmeric. Stir over medium heat until thick and glossy.
Spread filling evenly over baked crust. Smooth with spatula.
Bake for 15 min. Remove from oven, let cool 30 min at room temp.
Refrigerate 1–2 hours or overnight until firm.
Lift bars with parchment, dust with powdered sugar, cut into 16 squares.
