In a bowl, stir together ricotta, asiago, parmesan, salt, and pepper flakes, if using. Set aside.
In a medium pan, heat 1 tbsp oil reserved from the sun dried tomatoes, or 1 tbsp olive oil.
Add onions and tomatoes and cook about 3-4 minutes, or until onions have softened.
Add garlic and cook for an addition 30 seconds, until fragrant.
Remove from heat, and let cool. Once cool, stir in to the cheese mixture until well combined.
If using fresh pasta sheets, cut the dough into either 2 inch diameter circles with a dough cutter, or into 2 inch cubes squares. If using wonton wrappers, skip this step.
Spoon about 1 tbsp of filling onto a wonton wrapper or pasta sheet.
Wet the edges of the wrapper or pasta with water, and place another sheet on top to cover filling. Crimp the edges of the ravioli with a fork to seal. Repeat for remaining filling and pasta sheets.
When ready to cook ravioli, boil until tender about 2-3 minutes.
Top with your favorite sauce, and enjoy!