Preheat the oven to 350°F (175°C) and line an 8×8-inch baking pan with parchment paper, leaving enough overhang to lift the brownies out easily after baking.
In a large mixing bowl, whisk together the almond flour, cocoa powder, baking powder, and sea salt until evenly combined and free of lumps.
In another bowl, whisk the eggs, Greek yogurt, melted butter, vanilla extract, and keto sweetener until the mixture is smooth, creamy, and fully blended.
Gradually add the dry ingredients to the wet ingredients, folding gently with a rubber spatula until no dry streaks remain. Avoid overmixing to keep the brownies tender.
Fold in most of the sugar-free chocolate chips, reserving a small handful to sprinkle over the top.
Spread the batter evenly into the prepared baking pan and smooth the surface with a spatula. Sprinkle the remaining chocolate chips over the top.
Bake for 22–28 minutes, or until the edges are set and the center is still slightly soft. A toothpick inserted into the center should come out with a few moist crumbs rather than wet batter.
Remove the brownies from the oven and let them cool completely in the pan. This allows them to finish setting and develop their rich, fudgy texture.
Lift the brownies out using the parchment paper and place them on a cutting board. Slice into even squares using a sharp knife, wiping the blade clean between cuts for neat edges.
Serve as they are or with keto whipped cream, sugar-free vanilla ice cream, fresh berries, or a drizzle of sugar-free chocolate sauce.