Preheat oven to 375⁰ F. Sauté onion in 1 tbsp of olive oil until lightly browned and season with a pinch of salt and pepper. Set aside in small bowl; allow to cool slightly.
Remove sausage from casing, sauté in same pan until browned; add sausage and drippings to bowl with onions. While mixture is cooling, dice tomato and add them to bowl.
Add cheese and Mayo to bowl, mix gently, place bowl in fridge
Open package of store biscuits; separate each biscuit into three portions
Press each portion into the molds of a greased mini cookie tin.
Using a spoon, fill each 'cup' with the mixture from the fridge, leaving a small amount of room at the top. Sprinkle each mixture with a pinch of oregano.
Bake about 10-12 minutes, each puff should expand, and be slightly browned.
Allow to cool for 4 minutes, and then remove from mold.