Scoop out the seeds and any stringiness from the cavity of the papaya half and discard. Sit the papaya, cut side up, on a plate or in a bowl. If the papaya is wobbly, cut a small slice from skin side to help it sit flat.
Fill the papaya cavity with yogurt then sprinkle granola over the top. Dot the berries and banana slices on top and around the sides, using the yogurt to hold them in place.
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Notes
All quantities are approximate as it will depend on the size of your papaya exactly how much fits.I found one small-ish single-serving container of yogurt (4.4oz/125g) of yogurt was about right for the papaya I had, but you may want more or less depending on the size you have, or as you prefer.I used a mango passion fruit Icelandic yogurt which pairs well, but plain yogurt, lemon, honey or a berry flavor would also be good. A thicker style such as Icelandic skyr or Greek yogurts are probably best to be able to hold the toppings, but again as you have and prefer.