Preheat the oven to 180C/350F. Line an 8 x 8-inch pan with parchment paper and set aside.
In a microwave safe bowl or stovetop, melt your chocolate. Set it aside to cool slightly.
Add the eggs to a large mixing bowl and beat the eggs together until completely whisked. Gently stir through the melted chocolate until a smooth batter remains. If using chocolate chips, fold them through at the end.
Transfer the brownie batter to the lined pan and bake for 25 minutes.
Let the brownies cool completely before slicing.
Notes
TO STORE: Leftovers can be stored at room temperature in an airtight container for up to one week. If you'd like these to keep longer, store them in the refrigerator for up to two weeks.TO FREEZE: Place the cooled brownies in a ziplock bag and store them in the freezer for up to 6 months.