Preheat the oven to 350°F/180°C. Line 2 baking sheets with parchment paper and set aside.
Pour the melted butter into a large mixing bowl. Whisk in the brown sugar and white granulated sugar until the mixture is well combined.
½ cup unsalted butter, ½ cup brown sugar, ½ cup granulated sugar
Add the egg, egg yolk, and vanilla. Whisk vigorously until well blended.
1 large egg, 1 egg yolk, 2 teaspoon vanilla extract
Add the flour, baking soda, and salt to the bowl. Fold the dry ingredients into the wet ingredients with a rubber spatula. Stop mixing when there are only a few dry streaks of flour left.
1 ½ cup all purpose flour, ½ teaspoon baking soda, 1 teaspoon sea salt
Add frozen raspberries and 1 tablespoon of flour to a separate small bowl. Gently toss the berries until they're coated with flour.
½ cup frozen raspberries
Fold the raspberries and chocolate chips into the cookie dough until just combined with no dry streaks of flour.
1 cup semi-sweet chocolate chips
Scoop cookie balls and place them onto the lined baking sheets with 2 inches between each.
Bake each tray for 9-13 minutes. Do not overbake! The cookies are done when the edges appear set and light brown. The middles will be puffy and look slightly underbaked.
Remove the cookie sheets from the oven. Let the cookies cool for 5 minutes on the pan, then transfer them to cool for 10 minutes on a wire rack. Enjoy the at room temperature.