Preheat the oven to 350F.
Prepare an eight-inch cheesecake pan by wrapping the sides and bottom with two layers of aluminum foil.
Lightly spray the inside of the pan with oil.
Place the chocolate and butter in a microwaveable bowl. Melt in the microwave oven for 45 seconds on HIGH. Mix until smooth. Cool for a bit.
Mix in the sugar and salt.
Add the egg and stir.
Lastly, add the flour and mix until the mixture looks homogenous.
Pour the brownie mix into the prepared pan. Bake at 350F for 40 to 45 minutes. Prick the center with a toothpick. If it comes out clean, the brownie crust is done.
The crust will be higher along the edges. That's how it should be.