My children love their weetbix bars for breakfast and at least 3-4 times a week, they have them. I always try to mix them with some fruit and nuts but it can get quite time-consuming especially when in a hurry. Instead, I have recently made a mix that I add to their weatbix bars along with milk. I often change the variety but just to give you an idea, here is one of our homemade mixes.
Ingredients of the mix in the picture above (from top to bottom):
Goji berries (wolfberries) (you can read more about them here)
Pepitas/pumpkin seeds (read more about them here)
Raisins and cranberries