Spaghetti Squash Casserole

Name: Spaghetti Squash Casserole
Cuisine: American
Ingredients: 1 spaghetti squash; 1 tablespoon avocado oil; 1 red onion (chopped); 1 serrano pepper (minced (more if you like it spicy)); 5 large garlic cloves (minced); 1 pound ground beef; 1 teaspoon oregano; 1 teaspoon paprika; 1 teaspoon cumin powder; 1 teaspoon fresh thyme (finely chopped); 1/2 teaspoon turmeric powder; 1/2 teaspoon chili powder; ¼ teaspoon crushed red pepper flakes; salt and pepper (adjust to taste (be sure to season well)); 1 green bell pepper (chopped); 1 14.5 ounce can organic diced tomatoes, drained; 1 egg (whisked); green onion (garnish)