2. Sift together the flour, cocoa powder, baking soda, and salt. Place in the bowl of a food processor.
3. Add the butter and sugars to the food processor and pulse until it resembles coarse meal. Add the egg and continue to pulse until a dough forms.
4. Roll the dough between two pieces of parchment paper or on a lightly floured surface until 1/4 inch thick and cut out cookies with a 2-inch heart shaped cookie cutter.
5. Bake for 12-15 minutes. Cookies will be soft at first, but harden as they cool.
6. In the bowl of a standing mixer or with an electric mixer, beat the heavy cream, powdered sugar and raspberries on high until light and fluffy.
7. Spread 1 teaspoon of filling onto half of the cookies and sandwich together with the remaining cookies.