Empty entire jar of salsa into a dutch oven or deep covered skillet.
Stir in the salt and add the garlic. If using whole cloves, just drop them in. If minced, stir to combine.
Nestle chicken breasts into the salsa and spoon a little over the top.
Cover with a lid and simmer on low heat for 45 minutes.
While the chicken is cooking, prep your toppings. Dice the tomatoes and onions, drain and rinse the black beans, etc.
When the chicken is done, remove it from the pan and set it aside on a large cutting board.
If you used whole garlic, remove it to the cutting board with the chicken.
Whisk the flour into the salsa until it's well combined. Continue to simmer, stirring frequently.
Shred the chicken with a fork and mash whole garlic cloves.
Add chicken and garlic back to the pan and stir.
Serve immediately with desired toppings or let cool completely, then cover and store in the refrigerator.