In a large bowl, prepare the 3 bags of falafel mix according to the package directions. Add in 3-4 tablespoons of water to make the batter a spreadable consistency. Set the batter aside.
Coat each chicken breast with flour, shaking off the excess. Heat 3 tablespoons olive oil in a large skillet over medium heat. Dip one side of each chicken breast into the prepared falafel mix. Pat it on to form a crust. Add to the hot oil, falafel side down, allowing the crust to form before flipping to cook on the other side, about 4-5 minutes per side.
Meanwhile, cut the tomatoes and cucumbers into medium dices.
Serve the falafel chicken with the diced tomatoes and cucumbers, and a dollop of hummus.