For the roasted pear puree: roast 2-3 pears in an oven preheated to 200C/400F/gas 6 for 15-20 mins until soft, then puree in a mixer until smooth (I like to keep the skins on but you can peel them before roasting if you prefer). You can easily batch make this and keep it in the fridge for up to a week, or freeze in ice cube trays to have on hand for more muffins, as a sub for applesauce in bakes, or in smoothies.
Fold in the diced pear and chopped nuts, if using then spoon the mixture into a lightly greased muffin tin until each hole is about 2/3 full (it should make about 6-8 muffins). If you like, you can slice another pear into wedges and top each muffin with a wedge, for decoration.
Bake in the preheated oven for 25-30 mins, or until cooked through. Serve warm (they dry out quickly when cool but will moisten again when warmed up) with yogurt (dairy or coconut) or cream.
*rice syrup is fructose-free, but it is counted as a free sugar by the World Healthy Organisation, so be mindful that it would mean the muffins have 1-2 teaspoons free sugars each, but rice syrup is pure glucose rather than fructose so is released more steadily and dealt with better by the body in moderation than fructose, which is dumped on the liver