Preheat the oven to 350 degrees F.
Toss the tutti frutti with the one tbsp of flour and set aside.
In a small bowl, mix together the milk and vinegar. Let it sit for 15 minutes to form vegan "buttermilk".
Sieve the flour and salt into a bowl.
After 15 minutes when the buttermilk is ready, stir the sugar, avocado oil, vanilla and milk into the flour mixture.
Mix everything together with a spatula, being careful not to overmix.
Add in the tutti frutti pieces, giving it one more stir.
Lightly grease the baking dish with avocado oil.
Evenly pour the cake mixture into the tray.
Bake for 45 minutes, until a toothpick inserted in the center comes out clean.
Once baked, remove from the oven. Let it fully cool, then cut and serve. Enjoy!