Grandma’s Perfect Jam Thumbprint Cookies

Yolks from organic eggs, large

All-purpose flour, pure organic unbleached

Almond extract, pure

Cane sugar, organic granulated

Confectioners' sugar, organic

Sea salt, fine-grain

Vanilla extract, pure

Butter, organic grass-fed unsalted

Homemade or fine-quality organic strawberry and/or seedless red raspberry jam