Peel plantains, then cut into chunks and place in a blender or food processor.
Add peeled garlic cloves, salt and avocado oil, then blend on high for 1 minute until a smooth dough forms.
Transfer dough to a cutting board. Spread into a ¼-in. thick sheet, then cut into circles using a shot glass or other small glass. You want circles about 2 inches in diameter. You could also cut the dough into squares.
Heat about ½ cup of avocado oil in a small saucepan on the stove.
Using a spatula, carefully peel the dough circles off the cutting board and drop them into the hot oil, being sure not to crowd them in the pan. My saucepan held about 4 at a time.
Fry for about 4 minutes, or until golden but not brown.
Remove fritters from oil and transfer to a colander to cool and drain excess oil. Serve with guacamole.