Start by heating a tablespoon of oil in a cast-iron skillet over medium-high heat. Add the diced peppers and onion. Sprinkle with a teaspoon or two of the seasoning blend and stir well, sautéing for 4 to 6 minutes until the vegetables soften. Remove the peppers and onions from the skillet and set them aside.
Dice the onion and peppers.
Wipe the skillet with a paper towel and add another tablespoon of oil. Add the backstrap to the skillet and season with another teaspoon or two of the spice blend (to your taste).
Cut the backstrap into bite-sized bits.
Sauté for 2 to 3 minutes until the meat is just browned. Add the shrimp and sprinkle on more seasoning blend. Cook for another 5 minutes until shrimp are just cooked through.
Saute the shrimp and backstrap together.
To assemble the quesadillas, lay four tortillas onto baking sheets. Evenly divide the shrimp / backstrap mixture and the pepper / onion mixture between the four. Sprinkle equal amounts of cheese on each of the quesadillas.
Top the tortillas with sauteed peppers, onions, shrimp, backstrap and cheese.
Top with remaining four tortillas and place the pans into a pre-heated 350-degree oven for 8 to 10 minutes or until the tortillas are lightly toasted and the cheese melted.
To serve, use a sharp knife or a pizza cutter to slice the quesadillas into wedges. Serve with sour cream, your favorite salsa, or freshly made guacamole for toppings.