Add the flour and salt and mix until well combined. The dough may seem crumbly; this is normal - it will come together when you roll it into balls.
Scoop the dough and roll into tablespoon-sized balls using your hands. Place on your parchment-lined baking sheets. Gently press a thumb or the back of a teaspoon into the center of each. Spoon jam into each thumbprint.
Nutrition analysis (approximate per cookie): 114 calories, 6 g fat, 2.5 g saturated fat, 85 mg sodium, 14.5 g carbohydrate, 0.3 g fiber, 7 g sugar, 1 g protein, Vitamin D: 0%, Calcium: 0%, Iron: 2%, Potassium: 0%