Preheat oven to 350℉ (180℃).
Prepare 2 baking sheets by lining with parchment paper or silicone baking mats.
In a medium bowl, whisk together flour, baking soda, salt and lemon zest. Set aside for later.
2 Cups All Purpose Flour, ½ teaspoon Baking Soda, 1 teaspoon Salt, 2 Tablespoons Lemon Zest
Place butter and sugar in the bowl of a stand mixer. Note: a hand-mixer may also be used.
Using the paddle attachment, begin mixing together the butter and granulated sugar until light and fluffy (approximately 2 - 4 minutes on medium speed). Scrape down sides of bowl as needed.
8 Tablespoons Butter, 1 Cup Granulated Sugar
Add the egg and lemon juice. Mix on low speed until incorporated. Scrape down sides of bowl as needed.
1 Large Egg, 2 Tablespoons Lemon Juice
Add the flour mixture and mix on low speed until combined.
Scoop approximately 1 ½ tablespoons of cookie dough and roll into a ball.
Gently press each ball of cookie dough into the sprinkles to coat one side. Place them on the prepared baking sheets, leaving about 2 inches of space between each cookie to allow for spreading. Note - If the sprinkles aren't sticking, brush the dough with a small amount of water before pressing.
⅔ Cup Sprinkles
Use the back of a ½ teaspoon to gently press an indentation into the center of each cookie, being careful not to press all the way through the dough.
Bake cookies for 10 - 12 minutes.
While the cookies are still warm, use the back of the ½ teaspoon spoon to increase the indentation in the center of each cookie.
Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer cookies to a wire rack to cool completely.
Fill the center of each cookie with raspberry jam. Enjoy!
½ Cup Raspberry Jam