Add 1 1/2 cups chopped dark chocolate to a pot on the stove set to low heat.
Cook, stirring often, until the chocolate has melted, then immediately remove the pot from the heat.
Preheat the oven to 350 degrees Fahrenheit.
Add 4 large ripe bananas, peeled to a mixing bowl, then use a potato masher or fork to mash them.
Add the melted dark chocolate, 1/4 cup maple syrup, 1 teaspoon vanilla extract, and 1/4 teaspoon salt to the mixing bowl, then mix well.
Add 3/4 cup whole wheat flour, then mix until incorporated.
Transfer the batter to an 8 inch baking dish lined with parchment paper.
Bake at 350 degrees Fahrenheit for 35 minutes.
Let the brownies cool to room temperature before slicing and serving.