Line the cookie sheet with parchment paper or spray it with non-stick cooking spray.
Get the oven preheating at 350 degrees Fahrenheit.
Add .75 cups of softened butter and .5 cup of sugar to the mixing bowl. Cream them together on medium high speed until light and fluffy. This usually takes about 2 - 3 minutes.
Add 1 egg yolk and 1 teaspoon of vanilla and beat on medium speed until well combined.
Turn the mixer on low and slowly add 1 ⅓ cups flour, .75 cups almond flour, 1 teaspoon cinnamon and .25 teaspoon sea salt. Continue mixing until ingredients are all thoroughly combined.
Place the dough into the fridge for 20 - 30 minutes or freezer for 10 - 15 minutes.
Lightly flour the counter, then roll the dough out to about ⅛ inch thickness. Then, use the 2.5 inch cookie cutter to cut the dough. Take the scraps and re-roll dough and continue cutting until all dough is used.
Take the smaller cookie cutter and use it on the center of half of the cookies.
Place all cookies an inch or so apart on the baking sheet and bake for 12 - 15 minutes or until edges are light brown.
Allow cookies to completely cool.
Take small spoonfuls of jam and place in the center of the bottoms of the cookies.
Then, take the cookie tops and lightly press and twist to secure them.
Finally, add a small sprinkle of powdered sugar to the top of each cookie.