Marinate the Tofu "Feta": In a small bowl, crumble the extra-firm tofu with your fingers into small, feta-like pieces. Add the lemon juice, dried oregano, and a pinch of black pepper. Toss gently to combine and set it aside to marinate.
Prepare the Oven and Skillet: Position an oven rack in the center and preheat to 375°F (190°C). Generously grease your 12-cup muffin tin with olive oil. In the large non-stick skillet, heat the remaining olive oil over medium heat.
Sauté the Aromatic Base: Add the chopped onion and red bell pepper to the hot skillet. Sauté for 5-6 minutes, stirring occasionally, until softened and translucent. Add the minced garlic and cook for another minute until fragrant.
Dry and Wilt the Spinach: Add the thoroughly squeezed spinach to the skillet with the aromatics. Stir continuously for 2-3 minutes to cook off any remaining moisture and allow the flavors to meld. Remove the skillet from the heat and let it cool for a few minutes.
Create the Egg Emulsion: In the large mixing bowl, combine the 4 whole eggs and 16 egg whites. Add the sweet paprika and baking powder. Whisk vigorously for 1 minute until the mixture is light, frothy, and uniform in color. This step incorporates air for a fluffier texture.
Infuse with Herbs and Fiber: Add the chopped parsley, dill, mint, and ground flaxseed meal to the egg mixture. Whisk again briefly to fully incorporate.
Combine the Components: Scrape the cooled spinach and vegetable mixture from the skillet into the egg bowl. Add the marinated tofu "feta" crumbles. Use a spatula to gently fold everything together until just combined.
Portion and Bake: Carefully pour or ladle the batter into the prepared muffin cups, filling each about three-quarters full. Bake for 20-22 minutes, or until the centers are set and a wooden skewer inserted into the center comes out clean.
Rest and Release: Let the muffin tin cool on a wire rack for 5 minutes. This allows the egg bites to firm up, making them easier to remove. Run a thin spatula around the edge of each bite to loosen, then gently lift them out. Serve warm or allow to cool completely for storage.