Jam-Filled Sugar Cookies

Mostly followed this recipe for the dough, with a little inspiration from here.

Ingredients
I measured by weight for precision
Jam / Nutella / other filling (~17 2.5 tsp dollops)
2 cups (280g) all-purpose flour
1/2 teaspoon baking soda
1/2 teaspoon salt
3/4 cup (170g) unsalted butter, softened to room temperature
1/2 cup (100g) granulated sugar
2/3 cup (80g) powdered sugar
1 large egg, at room temperature
1-2 teaspoon vanilla extract

Instructions

1. In a medium bowl, sift together flour, baking soda, and salt. Set aside.
2. Cream butter and both sugars. Use a big bowl and mixer on low speed.
3. Add egg and vanilla extract and beat until combined. Make sure the eggs are fully incorporated into the butter and there is no liquid left in the batter.
4. With the mixer on slow, add the dry ingredients into the batter and keep mixing on low speed until everything is well incorporated.
5. Wrap the prepared cookie dough tightly in cling film and let it chill in the fridge for 8 hours, or ideally overnight.
6. The next day, prep the filling: pipe or spoon little dollops (~2.5 teaspoons) of the filling onto wax/parchment paper and freeze on a cookie sheet for ~1 hour. I liked putting a little peanut butter in my Nutella dollops.
7. Take the cookie dough out of the fridge and weigh out ~40 gram portions. Should get ~17 portions.
8. Flatten the portions into disks. Place chilled filling in the center of a disk and wrap the dough around it to form a ball.

• Some tips about filling: For the peanut butter ones, if you place the peanut butter side down and end up cooking it that way, the peanut butter seeps into the dough and influences the flavor (makes it taste kind of like a peanut butter cookie); not bad, just different. Also, the Nutella melts really quickly so you might want to pull one out of the freezer at a time.

9. Place filled balls on baking sheets lined with parchment paper. Chill in the fridge for 15-30 minutes before baking.
10. Preheat oven to 350°F/180°C. Place sugar in a bowl and roll the chilled cookie dough balls in the mixture. Definitely do this for the jam-filled cookies. The Nutella ones are already pretty sweet, so depends on preference.
11. Bake for 13 minutes. I could fit 6 at a time on my cookie sheet. The cookies should mostly stay white, turning very very light brown around the edges.
12. Top with powdered sugar after cooled.