01 - Combine softened cream cheese and sour cream in a mixing bowl. Beat with a spoon or electric mixer until completely smooth and spreadable, approximately 2 minutes.
02 - Add shredded cheddar, diced red bell pepper, chopped green onions, black olives, garlic powder, salt, and pepper to the cream cheese mixture. Stir thoroughly until all ingredients are evenly distributed throughout the filling.
03 - Place one tortilla flat on a clean cutting board or work surface. Spread one-quarter of the filling mixture evenly across the entire tortilla surface, extending completely to the edges. Roll tightly from one end to form a compact cylinder.
04 - Repeat the spreading and rolling process with the remaining three tortillas and filling portions. Ensure each roll is tight and uniform to prevent gaps in the pinwheel slices.
05 - Wrap each rolled tortilla individually in plastic wrap. Refrigerate for a minimum of 1 hour, up to overnight. Chilling firms the filling and ensures clean, neat slicing.
06 - Remove plastic wrap from chilled rolls. Using a sharp knife, slice each roll into 6 equal pinwheels approximately 1 inch thick. Arrange on a serving platter and serve immediately, or keep refrigerated until ready to serve.