Preheat the oven to 375 degrees F (190 degrees C). Use 1 tablespoon butter to grease a 9×13-inch pan.
Scatter thawed berries and chopped dark chocolate evenly over the bottom of the pan. Set aside.
Whisk together flour, sugar, cocoa powder, salt, and cinnamon in a large bowl until thoroughly combined. Add in eggs, and whisk until mixture is smooth and free of lumps. Mix in 2 tablespoons melted butter, vanilla, and almond extracts. Gradually pour in milk and heavy cream, whisking constantly, until incorporated. Pour batter over berries and chocolate in the prepared pan.
Place pan into the preheated oven and bake until the center is just set and sides are slightly puffed, about 25 minutes. Can be eaten immediately, cooled slightly, or at room temperature, as desired. Sprinkle generously with powdered sugar before serving.
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