Preheat the oven to 350°F (180°C).
Add the softened butter to the mixing bowl and beat it for a minute (You can use a hand mixer or a stand mixer. If using a stand mixer, use a paddle-shaped attachment).
½ cup + 2 Tablespoons (10 Tbsp in total, 140g) soft butter
Add the Biscoff spread and beat it with butter for a minute.
½ cup (130g) Biscoff spread/ cookie butter
Add both types of sugar. Mix over medium-low speed for about 3 minutes, until light, fluffy, and well combined.
⅔ cup (135g) light brown sugar, ⅓ cup (65g) granulated sugar
Add the egg and vanilla extract, mix over medium-low speed for another 2-3 minutes, until well combined. Scrape down the sides of the bowl from time to time with a spatula.
1 large egg, 2 teaspoons pure vanilla extract
Stir together the flour, baking soda, baking powder, cinnamon, and salt. Add the flour mixture to the mixing bowl. Mix on low speed until partially combined (you should still see some flour, and the dough will be rather clumpy).
1 3/4 cups (220g) all-purpose flour, 1/2 teaspoon baking soda, 1/2 teaspoon baking powder, 1/2 teaspoon ground cinnamon, 1/4 teaspoon salt
Reserve about 1/5 of the chocolate chips (or chopped chocolate) to press on top of the cookie dough balls. Add the remaining chocolate chips to the bowl. Mix until the chocolate is evenly distributed and the flour fully incorporated (but don't overmix).
5 ounces (140g) dark chocolate chips, 5 ounces (140g) semi-sweet chocolate chips
Scoop the dough with a 3-tablespoon scoop and place it on a baking sheet lined with parchment paper, about 2 inches (5 cm) apart. Don’t flatten the cookies. If you want to bake them right away, try to shape them a little taller. Place the remaining dough in the fridge. If you want taller/thicker cookies, refrigerate the dough for 30 minutes before baking. However, if you shape the cookie dough balls to be taller rather than round, the cookies won’t turn out flat anyway. Place some of the reserved chocolate chips on top of the cookie dough balls and press them in slightly.
Bake the cookies in batches for about 13 minutes. The baking time may vary slightly depending on your oven. The cookies should have slightly golden edges but remain completely soft.
Take the baking tray out of the oven and let the cookies cool on the baking sheet for a couple of minutes. When they are sturdy enough to handle, transfer them to a cooling rack. Always use a cooled baking sheet for the next batch of cookies.
Enjoy!