Preheat oven to 350 degrees.
Grease a 9 x 13 metal baking pan. Set aside.
Chop chocolate bar then microwave with butter in a large heat-safe bowl in 30 second increments, stirring after each increment until melted and smooth.
Add granulated sugar and brown sugar to bowl then whisk vigorously until completely combined.
Cool for for 5 minutes before adding eggs.
Add eggs, one at a time, whisking vigorously after each addition until fully incorporated.
Add vanilla then stir until evenly distributed. Set aside.
In a separate bowl, sift together flour, unsweetened cocoa powder, Dutch processed cocoa powder and salt.
Add dry ingredients to wet, stirring with a spoon until just combined. Avoid overmixing.
Pour batter into baking pan then smooth top with a spatula to level.
Bake for 30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs. Avoid overbaking.
Remove brownies from the oven and cool to room temperature.
Top brownies with chopped strawberries.
Drizzle melted chocolate on top of chopped strawberries.
After melted chocolate has set, top with quartered strawberries.
Cut and serve. For pristine slices, clean knife with hot water in between cuts.
Store brownies in an airtight container at room temperature up to 3 days.