In a large bowl, beat together butter and sugar until fluffy
Beat in egg yolks and vanilla extract
Add salt and flour and mix until well combined
Cover and chill dough for at least 30 minutes **see notes
Preheat oven to 350 degrees F
Line baking sheets with parchment paper or silicone mat
Divide dough with a cookie dough scoop and roll into a one-inch ball
Place on prepared baking sheet and gently press each cookie with your thumb, tart shaper or the back of the cookie dough scoop in the center
Spoon ½-1 teaspoon jam into each cookie
Bake for 12-14 minutes or until slightly firm and lightly golden brown
Remove from oven and cool on wire rack
Store in a single layer in airtight container
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