Prep the cauliflower rice: If using a whole head, cut into florets and pulse in a food processor until it looks like rice.
Work in batches so you don’t over-process. If using pre-riced, skip this step.
Slice the sausage: Cut it into 1/4-inch coins or small half-moons for quick browning and easy bites.
Brown the sausage: Heat 1 tablespoon oil in a large skillet over medium-high. Add sausage and cook 4–6 minutes until browned at the edges.
Transfer to a bowl and keep the drippings in the pan.
Sauté aromatics: Lower heat to medium. Add the remaining oil and the butter. Stir in onion and bell pepper with a pinch of salt.
Cook 4–5 minutes until softened. Add garlic and cook 30 seconds until fragrant.
Season it up: Stir in smoked paprika, oregano, and red pepper flakes. If using tomato paste, add it now and cook 1 minute to toast.
Add the cauliflower rice: Raise heat to medium-high.
Add riced cauliflower. Spread it out, let it sit 1–2 minutes to steam off moisture, then stir. Cook 5–7 minutes, stirring occasionally, until tender but not wet.
Finish with greens: Fold in spinach or kale and cook 1–2 minutes until wilted.
Return sausage to the pan and toss to combine.
Balance and taste: Add lemon juice, then taste and season with salt and pepper. If you like, stir in Parmesan for a creamy, savory finish.
Cool and portion: Let the mixture cool for 10–15 minutes. Divide into 4 meal prep containers.
Garnish with parsley or green onions.