Wash and dry the pumpkin. Then cut a piece, removing the fibers and seeds. Peel it (place the piece on a board and peel downwards with a knife) and cut it into similar-sized pieces. Place the pumpkin pieces on a baking sheet lined with parchment paper. Season with a pinch of salt. Put in a preheated oven at 200°C and bake until soft, about 15-20 minutes.
In a bowl, mix flour, sweetener, baking soda, and baking powder thoroughly.
Transfer the slightly cooled pumpkin to a blender container. Add the yogurt and egg. Blend until smooth and uniform.
Add the blended mixture to the bowl with dry ingredients and mix thoroughly using a spoon or spatula. The mixture should be free of lumps.
Transfer the batter to a parchment-lined loaf pan and place it in a preheated oven at 180°C. Bake until risen and browned, about 50-60 minutes. Remove from the oven and let cool.
Remove the bread from the pan and slice only after it has completely cooled. Enjoy cold or warmed.