Slice croissants in half lengthwise. Spread 1/2 tablespoon mayonnaise on each half. 2. Heat a pan over medium heat & toast croissants, mayo side down, in pan until golden brown about 2-3 minutes. Put a cheese slice on 2 of the toasted buns. 3. In same pan, fry the eggs sunny side up.4. Warm sausages through and assemble the sandwich. Serve warm. Enjoy!