Pat the sirloin steak cubes dry with paper towels to remove excess moisture.
In a large skillet, heat the olive oil over medium-high heat.
Add the steak cubes in a single layer and sear for 1-2 minutes on each side until browned but not cooked through. Work in batches if necessary to avoid overcrowding.
Transfer the seared steak bites to the crockpot.
In a small saucepan, melt the butter over medium heat.
Add the minced garlic and cook for 1-2 minutes until fragrant, stirring frequently to prevent burning.
Remove the saucepan from heat and stir in the salt, black pepper, dried parsley, smoked paprika, and beef broth.
Pour the garlic butter sauce evenly over the steak bites in the crockpot.
Cover and cook on low for 2.5 to 3 hours until the steak bites are tender and infused with the garlic butter flavor.
Stir gently before serving to coat the steak bites in the sauce.
Serve hot as an appetizer or over rice or mashed potatoes for a main dish.