Cat Paws

150 grams of all-purpose flour
150 grams of corn starch (Maizena)
70 grams of powdered sugar
110 grams (8 tablespoons) of softened butter
1 large egg
1 teaspoon of vanilla extract
a pinch of salt
100 grams of dark chocolate
Dulce de leche, strawberry jam, etc. (filling of your choice)