Heat a large fry pan with a medium heat and add in 3 tbsp (45 ml) olive oil

After a couple of minutes, add in the chopped onion and mix continuously, after 2 to 3 minutes and the onions are slightly translucent, add in the sliced mushrooms and season with salt, mix together, then mix every 2 to 3 minutes

Once the mushrooms are lightly browned, about 8 to 10 minutes, add in the chopped garlic, dried thyme, and crushed red pepper, mix continuously for 1 minute, then turn off the heat

Add the flour and baking powder into a large bowl and whisk them together, then make a well in the middle, crack in the egg, and whisk the egg, and then add in the club soda and whisk everything together until you get a smooth batter, then add in the sautéed mushrooms, grated cheese, chopped chives, and season with salt & pepper, mix together until well mixed

Heat the same fry pan with a medium heat and add in 1/3 cup (90 ml) olive oil

After a couple of minutes, start adding in spoonfuls of the batter, you want all the fritters in a single layer and evenly spaced out, so cook in batches, fry for 3 minutes per side or until golden and crispy, and as you finish each batch, transfer the fritters into a dish with paper towels

To make the mayo aioli, add the mayonnaise into a bowl, along with the grated garlic, lemon juice, olive oil, and season with salt & pepper, whisk together until you get a creamy sauce

Transfer the mayo aioli into a serving dish, and decorate the fritters around it, top off with chopped chives, serve at once, enjoy!