Cover with foil & bake 15 to 20 minutes, until they start to soften.
Heat remaining tablespoon of oil in lg skillet over medium heat.
Saute onion, garlic, salt, black pepper, chili powder, & cumin.
Cook until vegetables are softened, about 3 minutes.
Add sausage to the skillet.
Cook until lightly browned, about 5 minutes.
Add salsa & spinach.
Cook, stirring occasionally, about 5 minutes.
Remove skillet from heat & stir in cooked brown rice and quinoa.
Fill pepper halves with turkey mixture.
Cover dish with foil & bake 20 to 25 minutes.
Remove foil & sprinkle cheese over the top.
Return to oven & bake, uncovered, until cheese melts, about 7-10 minutes.
Top peppers with a heaping tablespoon of yogurt.
Place slices of avocado on top of each pepper.
Sprinkle with basil.
Serve immediately.
Substituting cayenne pepper for chili powder alters the capsaicin profile, sharply increasing heat without the earthy, cumin-heavy background notes built into commercial chili powder blends. Without careful moisture management, stuffed bell peppers turn into a watery disaster. Bell peppers are roughly ninety-two percent water by weight, and trapping them under foil at three hundred seventy-five degrees Fahrenheit forces that moisture straight into the baking dish. Initial pre-baking for fifteen to twenty minutes softens the fibrous walls, but it also pools liquid inside the cavity that must be drained before stuffing. Frozen spinach exacerbates this issue. Thawed spinach holds onto excess water like a sponge; squeezing it by hand removes surface moisture, but thermal compression inside the skillet releases bound water into the meat and grain filling. Combining cooked grains like brown rice and quinoa off the heat prevents them from absorbing that expelled liquid and turning into mush. Fat content plays a dual role here. Lean ground turkey lacks the rendered fat of pork sausage, meaning the filling can dry out during the final twenty to twenty-five minute covered bake unless the salsa provides sufficient acidity and moisture. Canned salsa or Ro-Tel brings high levels of citric and malic acid, which chemically tenderize the turkey protein while breaking down starches. Fresh tomatoes release water differently than canned variants, often requiring a longer reduction time in the skillet to achieve the same concentration of soluble solids. Removing the foil for the final seven to ten minutes allows excess steam to escape while the low-fat cheddar melts under direct radiant heat. Acidic dairy components like low-fat Greek yogurt applied at service provide lactic acid contrast to balance the rich, dense fats of the avocado topping.