Creating Chili Beef with Mushrooms is simple when you follow these steps:

1. Prepare Ingredients: Gather all the ingredients and chop vegetables as needed.
2. Heat Oil: In a large skillet, heat the olive oil over medium heat.
3. Cook Beef: Add the ground beef to the skillet. Cook until browned, breaking it apart with a spatula, about 5-7 minutes.
4. Add Onions and Garlic: Stir in the chopped onion and minced garlic. Sauté until the onion is translucent, about 3-4 minutes.
5. Incorporate Vegetables: Add the sliced mushrooms and diced bell pepper. Cook for another 5 minutes until they soften.
6. Mix in Tomatoes: Pour in the diced tomatoes and tomato sauce. Stir to combine all ingredients.
7. Season: Add chili powder, cumin, salt, black pepper, and cayenne pepper (if using). Mix well.
8. Simmer: Reduce the heat to low. Allow the mixture to simmer for 20-25 minutes, stirring occasionally. This helps to meld the flavors.
9. Taste and Adjust: Taste the dish and adjust seasonings as needed. You can add more chili powder for extra heat or salt to enhance flavor.
10. Serve: Once cooked, remove from heat. Garnish with fresh cilantro if desired.

These straightforward steps will lead you to create a delicious Chili Beef with Mushrooms that you and your family will love.