Step 1
Preheat the oven to 375 degrees F (190 degrees C).
Step 2
Place squash halves on a baking sheet. Brush insides with about 1 tablespoon olive oil and season with salt and pepper.
Step 3
Bake in the preheated oven until squash is tender enough to scoop out and mash about 30 minutes. Leave oven on.
Step 4
Place sweet potatoes into a large pot and cover with water; bring to a boil. Reduce heat to medium-low and simmer until tender about 20 minutes. Drain.
Step 5
Heat 1 tablespoon oil in a skillet over medium-high heat; stir in onion and garlic. Season with salt and pepper. Saute until onion has softened and browned 5 to 7 minutes.
Step 6
Remove 1/3 of the onion-garlic mixture. Add ground turkey to the skillet with the rest of the onions. Saute until turkey is no longer pink 5 to 7 minutes. Add turkey gravy Worcestershire sauce thyme and oregano. Cook and stir until flavors combine 2 to 3 minutes.
Step 7
Remove and discard squash seeds and scoop insides into a bowl. Add sweet potatoes reserved onion-garlic mixture butter and milk; mash together until smooth.
Step 8
Spread turkey mixture into the bottom of a 9-inch square baking pan. Top with corn and peas; add the sweet potato mash last. Sprinkle with chili powder.
Step 9
Bake in the hot oven until top begins to brown 30 to 45 minutes.