Beat in eggs. Add flour mixture and mix on low speed until thoroughly combined. Stir in vanilla. Heat oven to 325 degrees. Cut into heart shapes.
Transfer cookies onto ungreased baking sheets.
Bake 8-10 minutes, or until edges of cookies just start to brown. Combine water and gelatin in 2-quart glass measure and heat on HIGH power in the microwave for 3 to 5 minutes or until the water is boiling. Stir until gelatin is dissolved. Pour into heart shaped molds, or pour in a 9 or 10 inch square pan and refrigerate until gelatin is set. Unmold heart shapes or use a small heart shaped cookie cutter to cut out hearts.