Kid-friendly Bubbly Fruit-Filled Crumbly Crisp in a Mug Recipe - Sticky Fingers Cooking

Ingredients

• 1/2 C fresh or frozen berries (use blueberries, raspberries, strawberries, blackberries, or mixed berries)
• 1/2 tsp cornstarch (or arrowroot powder)
• 2 tsp sugar
• 1/2 lemon
• 1/3 C quick-cooking oats **(for GLUTEN ALLERGY use certified gluten-free quick oats or gluten-free cornflakes cereal)**
• 2 tsp brown sugar or maple syrup
• 2 T olive oil