Preheat oven to 350 degrees. Grease an 8x8 square pan.
In a mixer, cream together the butter and Splenda. Add the eggs, one at a time, incorporating well. Add the vanilla and cream, blending well. In a small bowl, mix together the almond flour, xantham gum, salt and baking soda. Add the almond flour mixture to the butter mixture, alternating with the chocolate. Fold in the nuts. This makes a very stiff batter - almost dough-like.
Spread the batter in the greased pan, and baking for about 12-13 minutes, or until a knife inserted comes out clean. Cut into 16 1-inch squares.
Makes 16 servings, 3.38 carbs per serving.