Some recipes available from Queen of Sauce are available elsewhere in game, so you might be getting recipes you already know for that reason.
If you are in year 3 or later, every episode on Sunday will be a repeat. There is literally only 32 recipes to get, 1 for every Sunday in year 1 and 2, in a precise order... and when year 3 starts up, the whole cycle starts at the beginning.
If you have not received all the recipes from Queen of Sauce, but did get most of them, Wednesday is the day you want to watch. In a solo game it will check for a recipe available from Queen of Sauce that has already aired at least once... and that's the recipe it'll give you.
If you are watching on Wednesday and it gets a recipe for you that you already have there are two possibilities... one, that you have all the recipes available from Queen of Sauce so far, or you're not playing solo.