Grease a 12-cup muffin tin with cooking spray. Arrange two wonton wrappers in each cup so that they are overlapping slightly with the edges sticking about 1 inch outside each cup.
Preheat the oven to 350°F.
In a large skillet set over medium heat, add the oil and sausage. Cook, breaking apart the sausage with a spatula, until it is cooked through. Add the marinara sauce and stir to combine. Remove the skillet from the heat.
In a small mixing bowl, stir together the ricotta cheese, Parmesan cheese, egg and Italian seasoning.
Divide the ricotta mixture among the muffin tin cups, then divide the sausage mixture among the cups, spooning it atop the ricotta.
Top each cup with a portion of the mozzarella cheese, then bake the lasagna cups until the edges of the wontons are crispy, 12 to 15 minutes.
Allow the lasagna cups to cool for 10 minutes before removing them from the muffin tin and serving.
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