Preheat oven to 350°F. Line a 9x9-inch pan with parchment paper or grease well.
In a small bowl, combine almond flour, cocoa powder, gelatin (if using), and salt. Whisk until all lumps are out. Set aside.
Melt the butter and 8 oz chocolate chips in the microwave in 30-second intervals (usually takes 2 times) or use a double boiler. Whisk until smooth and set aside.
In a stand mixer with whisk attachment, beat the eggs and yolk, sweetener, vanilla, and milk on medium-high for 8 minutes until lighter in color and fluffy.
Add the butter/chocolate mixture to the bowl and mix on low until combined.
Fold the dry ingredients and 3/4 cup chocolate chips in gently with a spatula. Do not overmix.
Pour into prepared 9x9 pan and spread evenly.
Bake at 350°F for 30 minutes until a toothpick comes out with moist crumbs (not clean, not wet batter).
Let cool completely in pan before cutting. For cleanest cuts, refrigerate for 30 minutes before slicing.