Melt the butter in a small saucepan, then let it cool to room temperature.
In a large bowl, whisk together the flour, baking powder, salt, and sugar until evenly combined.
In another bowl, whisk the eggs, then add the melted butter, vanilla extract, and milk. Whisk until smooth to create a homogenous batter.
Gradually pour the wet ingredients into the dry ingredients, whisking constantly. Be careful not to overmix, as this can make the waffles tough.
Preheat your waffle iron and lightly grease it with butter or oil to prevent the batter from sticking.
Pour a portion of batter into the waffle iron and sprinkle with the dark chocolate and white chocolate chips.
Cook until golden brown, about 5-7 minutes, or until the waffle is crispy on the outside and soft on the inside.
Remove the cooked waffle and let it cool on a wire rack for a few minutes.
Drizzle with caramel sauce, then sprinkle with toasted walnuts and chopped pistachios for an extra burst of flavor.
Serve with whipped cream on top and enjoy your gourmet waffle.
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