Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper or aluminum foil to simplify cleanup.

In a large mixing bowl, place the ground beef, diced onion, diced green bell pepper, eggs, kosher salt, black pepper, drained diced tomatoes, and crushed Ritz crackers. Using either your hands or a sturdy wooden spoon, gently mix the ingredients until just combined. Be careful not to overmix, as this can affect the tenderness of the meatloaf.

Transfer the mixture to the prepared baking sheet. Shape it into a compact, even loaf to ensure consistent cooking. Aim for a uniform thickness throughout.

Place the baking sheet in the preheated oven and bake the meatloaf for 30 minutes. This initial bake allows the flavors to meld and the meat to begin cooking.

After 30 minutes of baking, remove the meatloaf from the oven. Using a pastry brush, spread the ketchup evenly over the top and sides of the loaf. This glaze will caramelize and add a tangy sweetness during the final bake.

Return the glazed meatloaf to the oven and continue baking for an additional 30 minutes, or until the internal temperature reaches 165°F (74°C). This ensures the meat is fully cooked.

Once baked, remove the meatloaf from the oven and allow it to rest at room temperature for 10 minutes. This resting period helps the juices redistribute, resulting in a moist and flavorful loaf. Slice and serve as desired.