This is a very simple traditional recipe, just the thing when you want to whip up something quick, easy, and comforting. It's an odd dessert that seems to be made up of parts from other desserts. The filling is gooey, like pecan pie with bits of apple. The outer edge is bubbly and chewy, like pralines. The top forms a thin, crisp crust that is like a sticky meringue or macaroon. In other words, this is not pudding-cup pudding but pudding in the English sense of the word, meaning dessert in general.
There is a strong similarity between Ozark pudding and the Huguenot tortes made around Charleston. I've read all sorts of stories about the provenance of this dessert. One account says that Bess Truman invented it to cheer up homesick Harry in the White House. Another tale reports that French Huguenots fleeing persecution brought this recipe over. Another story is that a Charleston cook tasted Ozark pudding on a trip to the Midwest, brought the recipe home, and prepared it to serve in the Huguenot tavern where she worked. No matter which version you believe, it's obvious that good recipes get around.