Step 1

Preheat the oven to 375°F.

Step 2

In a bowl, combine butter, orange zest, sugar, and brown sugar with an electric mixer until smooth and creamy.

Step 3

Add vanilla extract and flax egg. Beat well.

Step 4

Sieve together flour, baking powder, baking soda, and salt. Add to wet mixture, alternating with the coconut milk, and mix well.

Step 5

Gently stir in the blackberries, being careful not to crush them.

Step 6

Refrigerate the dough for 2 hours.

Step 7

Make balls the size of a golf ball, and place them on cookie sheets lined with silicone mats.

Step 8

Bake in the top of the oven, 12 to 15 minutes.

Step 9

Let cookies stand 5 minutes on the cookie sheet before placing on a rack. Let them cool completely. During that time mix powdered sugar and coconut milk in a bowl.

Step 10

Pour the frosting over the top of the cookies with a spoon.