Preheat the oven to 350°F. Grease an 8" square pan and line it with parchment paper.
In a medium-sized bowl, whisk together the 5 tablespoons unsalted butter, 3 large eggs, and 1 ½ cups granulated sugar, then stir in the ½ teaspoon fine sea salt, 1 teaspoon pure vanilla extract, and ¾ cup unsweetened cocoa powder until smooth.
Then stir in the 1 ½ cups almond flour and 1 teaspoon baking powder; don't overmix. Fold in the ½ cup semisweet chocolate chips.
Pour the batter into the prepared pan, spreading it to the edges and smoothing the top with a rubber spatula.
Place the brownies in the oven and bake for 33 to 38 minutes, until the top is set and a tester inserted in the center comes nearly clean. (A few crumbs and a little chocolate at the end of the tester is OK.)
Remove the brownies from the oven and cool them for about 15 minutes before cutting.
Notes
Don't overmix. Even though there's no gluten in this recipe (one reason you don't want to overmix some gluten-containing recipes is that they can turn out tough), it's still a good idea to fold in the dry ingredients gently. When a smooth batter forms, stop, and pour it into the prepared pan.
Then, don't overbake. As with all brownies, don't overbake! The brownies are done when the edges are set, and a tester comes out with a few moist crumbs. They will set further out of the oven.
Cool before cutting. Another brownie rule, even though it's SO hard to wait, is to cool the brownies before cutting. This is especially important when using almond flour or baking other gluten-free brownies, since they will firm up as they cool.
Cut larger brownies. I wrote this recipe to make 16 servings, but you can certainly cut larger portions to make, say, 12 brownies.
Leave out the chocolate chips. If you don't have any on hand, don't stress. I'll make these brownies without chips, too, and they are just as delicious.
Serving ideas. With milk!!!! As the base for an ice cream sundae. Make into gluten-free cake pops. Cut them super mini and make brownie bites.