Process blue and cream cheeses in a food processor until smooth. (Can be covered and refrigerated for several weeks.)
When ready to serve, pre-heat oven to 450 degrees. Place sliced bread on a wire rack and bake until golden brown, about 5 minutes. Cool to room temperature.
Toast walnuts in a small skillet over low heat, shaking pan occasionally, until fragrant and slightly darker in color, about 5 minutes. Spread a portion of the cheese mixture on each toast. Top with a dollop of Apple Butter, sprinkle with chopped walnuts, and serve.
Makes 36 servings