Microwave the frozen cauliflower rice according to the package instructions, typically for about 4-5 minutes. Drain any excess moisture and set aside.

In a medium skillet, heat 1-2 tablespoons of butter over medium heat. Once melted, add 2-3 cloves of minced garlic and sauté until fragrant and lightly golden.

Add the prepared cauliflower rice to the skillet and stir to coat with garlic butter. Cook for 2-3 minutes until heated through and tender.

Reduce heat to medium-low, sprinkle in 1/2 cup of grated Parmesan cheese, and stir until melted and creamy. Season with salt and black pepper to taste.

Remove from heat, garnish with red pepper flakes if desired, and serve warm as a keto-friendly side dish or a satisfying vegetarian option.