Preheat oven to 350 degrees F (175 degrees C).
Melt the butter in a 2-quart casserole, and place the frozen blintzes on top of the butter in a single layer. Mix the eggs, sour cream, sugar, salt, vanilla extract, and orange juice in a bowl until thoroughly combined, and pour the mixture over the blintzes.
Bake in the preheated oven until the top is lightly browned, and a toothpick inserted into the center of the casserole comes out clean, about 45 minutes.
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