Chocolate Chip Loaf Cake: Preheat the oven to 320°F (160°C). Line a loaf pan with parchment paper and set aside.
In a bowl, sift together the all-purpose flour and baking powder. Set aside. In a large mixing bowl, combine the granulated sugar, salt, and unsalted butter.
Using a stand mixer fitted with the paddle attachment or a hand mixer, beat on high speed for 3 minutes, until pale and creamy. Scrape down the sides of the bowl.
Add the eggs one at a time, mixing on medium speed after each addition until fully incorporated. Reduce the mixer speed to low and add half of the dry ingredients. Add the sour cream, oil, and vanilla extract, mixing until combined.
Add the remaining dry ingredients and mix just until no dry flour remains. Scrape down the bowl with a rubber spatula to ensure everything is evenly mixed.
Lightly toss the mini chocolate chips with flour, then gently fold them into the batter using a spatula. Pour the batter into the prepared loaf pan.
Run a butter knife straight down the center of the batter to help control cracking during baking.
Bake for 1 hour 25–30 minutes, or until a toothpick inserted in the center comes out clean. Let the loaf cool in the pan for 10 minutes, then remove and transfer to a wire rack to cool completely.
Chocolate Ganache: Once the loaf has fully cooled, prepare the ganache. Place the dark chocolate in a heatproof bowl. Heat the heavy cream in a small saucepan just until it begins to simmer.
Pour the hot cream over the chocolate and let it sit for 2 minutes. Stir until smooth and glossy. Pour the ganache over the cooled loaf cake and finish with additional chocolate chips if desired.