Season the chicken with salt and pepper. Place the flour and garlic powder in a shallow bowl and dredge the chicken through the flour mix, pressing to adhere.Heat 2 tablespoons olive oil in a large skillet set over medium-high heat. When the oil shimmers, add the chicken and sear on both sides until golden, about 5 minutes per side. Remove the chicken from the skillet.To the skillet, add 1 tablespoon olive oil, the shallots, garlic, thyme, and a pinch each of red pepper chili flakes, salt, and pepper. Cook 3-4 minutes, until fragrant. Add butter and spinach. Cook another 2-3 minutes, until the spinach is wilted.Pour in the wine and broth. Cook 8 minutes until reduced slightly, then add the tortellini and cook another 2 minutes. Pour in the cream and add the parmesan, stirring until melted and creamy. Add the chicken back to the skillet and simmer for 5 minutes or until warmed through and the sauce has thickened slightly. Serve the chicken topped with the spinach cream sauce. Squeeze over a bit of lemon juice and a sprinkling of parmesan.