Lacy Chocolate Oatmeal Cookie Sandwiches

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8 tablespoons (1 stick) unsalted butter, melted

1 cup rolled oats (regular oatmeal) finely chopped, but not ground to a powder, in the food processor

1 cup sugar

1/2 teaspoon salt

1 large egg

1 teaspoon vanilla extract

1 teaspoon orange juice, strained

6 ounces semisweet or bittersweet chocolate, melted and cooled, for sandwiching the cookies

3 or 4 sheets or jelly roll pans covered with buttered foil