Preheat the oven to 350 degrees F (175 degrees C).

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Remove and discard rind from Brie. Slice cheese into about 12 pieces and place in a microwave-safe bowl. Add cream cheese and butter.

Microwave at 50% power, stirring every 45 seconds, until all ingredients are melted together. Stir vigorously until smooth. Transfer to a small (2-cup) oven-proof baking dish.

Bake in the preheated oven until dip is bubbly at the edges, 15 to 20 minutes.