GFCF Chocolate Mousse Tart with Shortbread Crust

A friend recently shared a shortbread tart crust recipe with me, and I thought a chocolate filling would compliment it well. The crust reminds me of Pecan Sandies. It does not have much flavor on it's own, but it's good with the chocolate filling. I've added vanilla extract to the recipe posted here - although I didn't use vanilla extract in the crust I made this weekend, I think the crust