In a medium-sized, heavy pot, add 1 1/2 cups mini chocolate chips and butter. Stir constantly over low heat until almost melted. Remove pot from heat and stir to finish melting completely. Set aside.
In a bowl, gently hand-whisk the flour, baking powder, and salt until combined. In separate bowl, hand-whisk together the sugar, eggs, and vanilla extract until fully smooth and incorporated. Slowly add melted chocolate mixture, stirring to combine well.
Fold the flour mixture into the chocolate mixture by hand, folding/stirring just until combined; don't over-stir. Let dough cool fully at moderate room temp.
Once dough is cooled, Gently work in the remaining 1/2 cup of mini chocolate chips. Wrap airtight and chill dough in fridge at least 1 hour, up to overnight.
Preheat oven to 350°F, with rack on lower-middle position. Line baking sheets with silicone baking mats or parchment paper. Form 1-tablespoon dough balls and place 2-inches apart on lined cookie sheet.
Bake 9-10 minutes, until cookies are puffed up, slightly cracked, with soft centers. Cookies may seem underbaked, but they will set upon cooling. If desired, gently press a few regular-sized chocolate chips on top of baked cookies while they're still a bit warm.
Notes
We like mini chocolate chips, as they melt faster and more evenly, giving the cookies a smooth, fudgey texture.
Melt chocolate gently. Keep the heat low and stir constantly to avoid burning or seizing the chocolate.
Let the dough cool before adding chips. This keeps the extra chocolate chips from melting into the batter.
I like using salted butter for a bit of extra flavor.
Baking dough balls as-is results in taller, thicker cookies. If you prefer them a bit flatter, lightly flatten the dough balls just before baking.
Many people like to use cookie scoops for ease of forming dough balls.
Unused cookie dough can be wrapped airtight and chilled for several days, or frozen for a couple of weeks.
Baked cookies can be kept in an airtight container at moderate room temperature for several days.
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