Condensed milk thumbprint cookies (1/2 stick or 1/4 cup) unsalted butter, room temperature 100g (1/2 cup) granulated (white) sugar 200g (2/3 cup) sweetened condensed milk 1 large egg 350g (2 4/5 cups) all-purpose (plain) flour 1 1/2 tsp baking (bicarb) soda 1/2 tsp salt 1/3 cup strawberry (or other) jam
