In a large bowl, whisk together the flour, sugar, salt, and active dry yeast.
Pour the warm milk into the dry ingredients, then add the egg, melted butter, and vanilla extract.
Mix the ingredients together, then knead the dough for 8-10 minutes until it becomes elastic and smooth.
Cover the dough and let it rise in a warm place for about 1 hour, or until doubled in size.
On a lightly floured surface, roll out the dough to about 1 cm thickness. Use a glass or doughnut cutter to cut out circles.
Place the cut-out doughnuts on a baking sheet lined with parchment paper and cover them with a clean kitchen towel. Let them rise for another 30 minutes.
In a large pot, heat the oil to about 340°F (170°C). Drop a doughnut into the oil as a test: if it immediately rises to the surface and bubbles gently, the oil is ready.
Fry the doughnuts for 1-2 minutes per side, or until golden brown. Use a slotted spoon to remove them, then place them on paper towels to absorb excess oil.
Once the doughnuts have cooled slightly, use a piping bag to fill them with avocado-honey filling.
Sprinkle the tops of the doughnuts with powdered sugar and a touch of cinnamon for an extra flavor boost.
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